diff --git a/.travis.yml b/.travis.yml
index 8beaf0b..a8c3c81 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,10 +4,9 @@ language: php
 services:
   - docker
 php:
-  - "7.1"
-  - "7.2"
   - "7.3"
   - "7.4"
+  - "8.0"
 matrix:
   fast_finish: true
   allow_failures:
diff --git a/composer.json b/composer.json
index 4888c29..1a363d0 100644
--- a/composer.json
+++ b/composer.json
@@ -9,10 +9,10 @@
     "search engine"
   ],
   "require": {
-    "php": "~7.0"
+    "php": "^7.3|^8.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^7.0"
+    "phpunit/phpunit": "^7.0|^9.0"
   },
   "autoload": {
     "psr-4": {
diff --git a/composer.lock b/composer.lock
index 6f6f052..55ca3cb 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,41 +4,36 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "69d278e676baae5553cd96974c093078",
+    "content-hash": "65d3bddfa41df1edbdedfcf7a8ba5028",
     "packages": [],
     "packages-dev": [
         {
             "name": "doctrine/instantiator",
-            "version": "1.2.0",
+            "version": "1.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "a2c590166b2133a4633738648b6b064edae0814a"
+                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/a2c590166b2133a4633738648b6b064edae0814a",
-                "reference": "a2c590166b2133a4633738648b6b064edae0814a",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/d56bf6102915de5702778fe20f2de3b2fe570b5b",
+                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "require-dev": {
-                "doctrine/coding-standard": "^6.0",
+                "doctrine/coding-standard": "^8.0",
                 "ext-pdo": "*",
                 "ext-phar": "*",
-                "phpbench/phpbench": "^0.13",
-                "phpstan/phpstan-phpunit": "^0.11",
-                "phpstan/phpstan-shim": "^0.11",
-                "phpunit/phpunit": "^7.0"
+                "phpbench/phpbench": "^0.13 || 1.0.0-alpha2",
+                "phpstan/phpstan": "^0.12",
+                "phpstan/phpstan-phpunit": "^0.12",
+                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
             },
             "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.2.x-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
@@ -52,7 +47,7 @@
                 {
                     "name": "Marco Pivetta",
                     "email": "ocramius@gmail.com",
-                    "homepage": "http://ocramius.github.com/"
+                    "homepage": "https://ocramius.github.io/"
                 }
             ],
             "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
@@ -61,24 +56,38 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2019-03-17T17:37:11+00:00"
+            "funding": [
+                {
+                    "url": "https://www.doctrine-project.org/sponsorship.html",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.patreon.com/phpdoctrine",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Finstantiator",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-11-10T18:47:58+00:00"
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.9.3",
+            "version": "1.10.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea"
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/007c053ae6f31bba39dfa19a7726f56e9763bbea",
-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/776f831124e9c62e1a2c601ecc52e776d8bb7220",
+                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "replace": {
                 "myclabs/deep-copy": "self.version"
@@ -109,32 +118,91 @@
                 "object",
                 "object graph"
             ],
-            "time": "2019-08-09T12:45:53+00:00"
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-11-13T09:40:50+00:00"
+        },
+        {
+            "name": "nikic/php-parser",
+            "version": "v4.10.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nikic/PHP-Parser.git",
+                "reference": "dbe56d23de8fcb157bbc0cfb3ad7c7de0cfb0984"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/dbe56d23de8fcb157bbc0cfb3ad7c7de0cfb0984",
+                "reference": "dbe56d23de8fcb157bbc0cfb3ad7c7de0cfb0984",
+                "shasum": ""
+            },
+            "require": {
+                "ext-tokenizer": "*",
+                "php": ">=7.0"
+            },
+            "require-dev": {
+                "ircmaxell/php-yacc": "^0.0.7",
+                "phpunit/phpunit": "^6.5 || ^7.0 || ^8.0 || ^9.0"
+            },
+            "bin": [
+                "bin/php-parse"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.9-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PhpParser\\": "lib/PhpParser"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Nikita Popov"
+                }
+            ],
+            "description": "A PHP parser written in PHP",
+            "keywords": [
+                "parser",
+                "php"
+            ],
+            "time": "2020-12-03T17:45:45+00:00"
         },
         {
             "name": "phar-io/manifest",
-            "version": "1.0.3",
+            "version": "2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/manifest.git",
-                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4"
+                "reference": "85265efd3af7ba3ca4b2a2c34dbfc5788dd29133"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phar-io/manifest/zipball/7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
-                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/85265efd3af7ba3ca4b2a2c34dbfc5788dd29133",
+                "reference": "85265efd3af7ba3ca4b2a2c34dbfc5788dd29133",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
                 "ext-phar": "*",
-                "phar-io/version": "^2.0",
-                "php": "^5.6 || ^7.0"
+                "ext-xmlwriter": "*",
+                "phar-io/version": "^3.0.1",
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0.x-dev"
+                    "dev-master": "2.0.x-dev"
                 }
             },
             "autoload": {
@@ -164,24 +232,24 @@
                 }
             ],
             "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
-            "time": "2018-07-08T19:23:20+00:00"
+            "time": "2020-06-27T14:33:11+00:00"
         },
         {
             "name": "phar-io/version",
-            "version": "2.0.1",
+            "version": "3.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/version.git",
-                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6"
+                "reference": "726c026815142e4f8677b7cb7f2249c9ffb7ecae"
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-                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/726c026815142e4f8677b7cb7f2249c9ffb7ecae",
+                "reference": "726c026815142e4f8677b7cb7f2249c9ffb7ecae",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.6 || ^7.0"
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "autoload": {
@@ -211,32 +279,29 @@
                 }
             ],
             "description": "Library for handling version information and constraints",
-            "time": "2018-07-08T19:19:57+00:00"
+            "time": "2020-11-30T09:21:21+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",
-            "version": "2.0.0",
+            "version": "2.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a"
+                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b"
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             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/63a995caa1ca9e5590304cd845c15ad6d482a62a",
-                "reference": "63a995caa1ca9e5590304cd845c15ad6d482a62a",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/1d01c49d4ed62f25aa84a747ad35d5a16924662b",
+                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.1"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "~6"
+                "php": "^7.2 || ^8.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.x-dev"
+                    "dev-2.x": "2.x-dev"
                 }
             },
             "autoload": {
@@ -263,44 +328,41 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2018-08-07T13:53:10+00:00"
+            "time": "2020-06-27T09:03:43+00:00"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
-            "version": "4.3.2",
+            "version": "5.2.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "b83ff7cfcfee7827e1e78b637a5904fe6a96698e"
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-                "reference": "b83ff7cfcfee7827e1e78b637a5904fe6a96698e",
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             },
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-                "php": "^7.0",
-                "phpdocumentor/reflection-common": "^1.0.0 || ^2.0.0",
-                "phpdocumentor/type-resolver": "~0.4 || ^1.0.0",
-                "webmozart/assert": "^1.0"
+                "ext-filter": "*",
+                "php": "^7.2 || ^8.0",
+                "phpdocumentor/reflection-common": "^2.2",
+                "phpdocumentor/type-resolver": "^1.3",
+                "webmozart/assert": "^1.9.1"
             },
             "require-dev": {
-                "doctrine/instantiator": "^1.0.5",
-                "mockery/mockery": "^1.0",
-                "phpunit/phpunit": "^6.4"
+                "mockery/mockery": "~1.3.2"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.x-dev"
+                    "dev-master": "5.x-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "phpDocumentor\\Reflection\\": [
-                        "src/"
-                    ]
+                    "phpDocumentor\\Reflection\\": "src"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -311,38 +373,40 @@
                 {
                     "name": "Mike van Riel",
                     "email": "me@mikevanriel.com"
+                },
+                {
+                    "name": "Jaap van Otterdijk",
+                    "email": "account@ijaap.nl"
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2019-09-12T14:27:41+00:00"
+            "time": "2020-09-03T19:13:55+00:00"
         },
         {
             "name": "phpdocumentor/type-resolver",
-            "version": "1.0.1",
+            "version": "1.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "2e32a6d48972b2c1976ed5d8967145b6cec4a4a9"
+                "reference": "6a467b8989322d92aa1c8bf2bebcc6e5c2ba55c0"
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-                "reference": "2e32a6d48972b2c1976ed5d8967145b6cec4a4a9",
+                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/6a467b8989322d92aa1c8bf2bebcc6e5c2ba55c0",
+                "reference": "6a467b8989322d92aa1c8bf2bebcc6e5c2ba55c0",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1",
+                "php": "^7.2 || ^8.0",
                 "phpdocumentor/reflection-common": "^2.0"
             },
             "require-dev": {
-                "ext-tokenizer": "^7.1",
-                "mockery/mockery": "~1",
-                "phpunit/phpunit": "^7.0"
+                "ext-tokenizer": "*"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.x-dev"
+                    "dev-1.x": "1.x-dev"
                 }
             },
             "autoload": {
@@ -361,37 +425,37 @@
                 }
             ],
             "description": "A PSR-5 based resolver of Class names, Types and Structural Element Names",
-            "time": "2019-08-22T18:11:29+00:00"
+            "time": "2020-09-17T18:55:26+00:00"
         },
         {
             "name": "phpspec/prophecy",
-            "version": "1.9.0",
+            "version": "1.12.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "f6811d96d97bdf400077a0cc100ae56aa32b9203"
+                "reference": "8ce87516be71aae9b956f81906aaf0338e0d8a2d"
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-                "reference": "f6811d96d97bdf400077a0cc100ae56aa32b9203",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/8ce87516be71aae9b956f81906aaf0338e0d8a2d",
+                "reference": "8ce87516be71aae9b956f81906aaf0338e0d8a2d",
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             "require": {
-                "doctrine/instantiator": "^1.0.2",
-                "php": "^5.3|^7.0",
-                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0|^5.0",
-                "sebastian/comparator": "^1.1|^2.0|^3.0",
-                "sebastian/recursion-context": "^1.0|^2.0|^3.0"
+                "doctrine/instantiator": "^1.2",
+                "php": "^7.2 || ~8.0, <8.1",
+                "phpdocumentor/reflection-docblock": "^5.2",
+                "sebastian/comparator": "^3.0 || ^4.0",
+                "sebastian/recursion-context": "^3.0 || ^4.0"
             },
             "require-dev": {
-                "phpspec/phpspec": "^2.5|^3.2",
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5 || ^7.1"
+                "phpspec/phpspec": "^6.0",
+                "phpunit/phpunit": "^8.0 || ^9.0 <9.3"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.8.x-dev"
+                    "dev-master": "1.11.x-dev"
                 }
             },
             "autoload": {
@@ -424,44 +488,48 @@
                 "spy",
                 "stub"
             ],
-            "time": "2019-10-03T11:07:50+00:00"
+            "time": "2020-09-29T09:10:42+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "6.1.4",
+            "version": "9.2.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "807e6013b00af69b6c5d9ceb4282d0393dbb9d8d"
+                "reference": "f3e026641cc91909d421802dd3ac7827ebfd97e1"
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-                "reference": "807e6013b00af69b6c5d9ceb4282d0393dbb9d8d",
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+                "reference": "f3e026641cc91909d421802dd3ac7827ebfd97e1",
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             },
             "require": {
                 "ext-dom": "*",
+                "ext-libxml": "*",
                 "ext-xmlwriter": "*",
-                "php": "^7.1",
-                "phpunit/php-file-iterator": "^2.0",
-                "phpunit/php-text-template": "^1.2.1",
-                "phpunit/php-token-stream": "^3.0",
-                "sebastian/code-unit-reverse-lookup": "^1.0.1",
-                "sebastian/environment": "^3.1 || ^4.0",
-                "sebastian/version": "^2.0.1",
-                "theseer/tokenizer": "^1.1"
+                "nikic/php-parser": "^4.10.2",
+                "php": ">=7.3",
+                "phpunit/php-file-iterator": "^3.0.3",
+                "phpunit/php-text-template": "^2.0.2",
+                "sebastian/code-unit-reverse-lookup": "^2.0.2",
+                "sebastian/complexity": "^2.0",
+                "sebastian/environment": "^5.1.2",
+                "sebastian/lines-of-code": "^1.0.3",
+                "sebastian/version": "^3.0.1",
+                "theseer/tokenizer": "^1.2.0"
             },
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-                "phpunit/phpunit": "^7.0"
+                "phpunit/phpunit": "^9.3"
             },
             "suggest": {
-                "ext-xdebug": "^2.6.0"
+                "ext-pcov": "*",
+                "ext-xdebug": "*"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "6.1-dev"
+                    "dev-master": "9.2-dev"
                 }
             },
             "autoload": {
@@ -476,8 +544,8 @@
             "authors": [
                 {
                     "name": "Sebastian Bergmann",
-                    "role": "lead",
-                    "email": "sebastian@phpunit.de"
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
                 }
             ],
             "description": "Library that provides collection, processing, and rendering functionality for PHP code coverage information.",
@@ -487,32 +555,38 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2018-10-31T16:06:48+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
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@@ -1351,7 +1810,11 @@
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+                    "dev-main": "1.20-dev"
+                },
+                "thanks": {
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+                    "url": "https://github.com/symfony/polyfill"
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@@ -1384,27 +1847,41 @@
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                 "portable"
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+            "funding": [
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+                    "url": "https://symfony.com/sponsor",
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+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
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+            ],
+            "time": "2020-10-23T14:02:19+00:00"
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@@ -1424,35 +1901,40 @@
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             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
-            "time": "2019-06-13T22:48:21+00:00"
+            "funding": [
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+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-07-12T23:59:07+00:00"
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-            "version": "1.5.0",
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+                "php": "^5.3.3 || ^7.0 || ^8.0",
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+            "conflict": {
+                "phpstan/phpstan": "<0.12.20",
+                "vimeo/psalm": "<3.9.1"
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@@ -1474,7 +1956,7 @@
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             ],
-            "time": "2019-08-24T08:43:50+00:00"
+            "time": "2020-07-08T17:02:28+00:00"
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     "aliases": [],
@@ -1483,7 +1965,8 @@
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     "prefer-lowest": false,
     "platform": {
-        "php": "^7.0"
+        "php": "^7.3|^8.0"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "1.1.0"
 }