Drop PHP <7.0 and HHVM support + upgrade to symfony 3.4 LTS

.travis.yml

@@ -13,12 +13,9 @@ cache:
 
 matrix:
     include:
-        - php: hhvm
-        - php: 5.5
-        - php: 5.6
-          env: deps=high
         - php: 7.0
-          env: deps=low
+        - php: 7.1
+        - php: 7.2
     fast_finish: true
 
 install:

composer.json

@@ -3,20 +3,20 @@
     "description": "Deptrac is a static code analysis tool that helps to enforce rules for dependencies between software layers.",
     "license": "MIT",
     "require": {
-        "php": ">=5.5.9",
+        "php": "^7.0",
         "graphp/graphviz": "0.2.*",
-        "nikic/php-parser": "^3.0",
+        "nikic/php-parser": "^3.1",
         "padraic/phar-updater": "^1.0",
         "phpdocumentor/graphviz": "~1.0",
         "sensiolabs-de/astrunner": "dev-master",
-        "symfony/config": "^2.7",
-        "symfony/console": "~2.7",
-        "symfony/dependency-injection": "^2.7",
-        "symfony/event-dispatcher": "^2.7",
-        "symfony/filesystem": "~2.7",
-        "symfony/finder": "~2.7",
-        "symfony/options-resolver": "^2.7",
-        "symfony/yaml": "^2.7"
+        "symfony/config": "^3.4",
+        "symfony/console": "^3.4",
+        "symfony/dependency-injection": "^3.4",
+        "symfony/event-dispatcher": "^3.4",
+        "symfony/filesystem": "^3.4",
+        "symfony/finder": "^3.4",
+        "symfony/options-resolver": "^3.4",
+        "symfony/yaml": "^3.4"
     },
     "authors": [
         {
@@ -25,7 +25,7 @@
         }
     ],
     "require-dev": {
-        "phpunit/phpunit": "^4.8 || ^5.5"
+        "phpunit/phpunit": "^5.7"
     },
     "autoload": {
         "psr-4": {