diff --git a/poetry.lock b/poetry.lock
index b0a0e1e..937e8c1 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -13,7 +13,7 @@ six = ">=1.6.1,<2.0"
 name = "atomicwrites"
 version = "1.4.0"
 description = "Atomic file writes."
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
@@ -21,7 +21,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 name = "attrs"
 version = "21.2.0"
 description = "Classes Without Boilerplate"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -117,17 +117,17 @@ importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 name = "colorama"
 version = "0.4.4"
 description = "Cross-platform colored terminal text."
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "coverage"
-version = "6.1.2"
+version = "6.3.1"
 description = "Code coverage measurement for Python"
 category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
 
 [package.dependencies]
 tomli = {version = "*", optional = true, markers = "extra == \"toml\""}
@@ -305,7 +305,7 @@ license = ["editdistance-s"]
 name = "importlib-metadata"
 version = "4.2.0"
 description = "Read metadata from Python packages"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -321,7 +321,7 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytes
 name = "iniconfig"
 version = "1.1.1"
 description = "iniconfig: brain-dead simple config-ini parsing"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "*"
 
@@ -505,7 +505,7 @@ python-versions = "*"
 name = "packaging"
 version = "21.2"
 description = "Core utilities for Python packages"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -548,7 +548,7 @@ test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock
 name = "pluggy"
 version = "1.0.0"
 description = "plugin and hook calling mechanisms for python"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -580,7 +580,7 @@ virtualenv = ">=20.0.8"
 name = "py"
 version = "1.11.0"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -634,15 +634,15 @@ Markdown = ">=3.2"
 name = "pyparsing"
 version = "2.4.7"
 description = "Python parsing module"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "pytest"
-version = "6.2.5"
+version = "7.0.0"
 description = "pytest: simple powerful testing with Python"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -655,10 +655,10 @@ iniconfig = "*"
 packaging = "*"
 pluggy = ">=0.12,<2.0"
 py = ">=1.8.2"
-toml = "*"
+tomli = ">=1.0.0"
 
 [package.extras]
-testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "xmlschema"]
 
 [[package]]
 name = "pytest-cov"
@@ -808,7 +808,7 @@ python-versions = ">=3.6.1"
 name = "toml"
 version = "0.10.2"
 description = "Python Library for Tom's Obvious, Minimal Language"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
@@ -840,7 +840,7 @@ python-versions = "*"
 name = "typing-extensions"
 version = "3.10.0.2"
 description = "Backported and Experimental Type Hints for Python 3.5+"
-category = "main"
+category = "dev"
 optional = false
 python-versions = "*"
 
@@ -879,7 +879,7 @@ watchmedo = ["PyYAML (>=3.10)"]
 name = "zipp"
 version = "3.6.0"
 description = "Backport of pathlib-compatible object wrapper for zip files"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
 
@@ -890,7 +890,7 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytes
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.7.1, <4.0"
-content-hash = "f9fc84022b8b18d199d6bfa0608cf7d93dd2ebfce104260c81c17546281815ac"
+content-hash = "b0cdb8b306c19895c198820d809bd060f02bf3a114cf8a6aebd75c04c6812f6f"
 
 [metadata.files]
 astunparse = [
@@ -933,53 +933,47 @@ colorama = [
     {file = "colorama-0.4.4.tar.gz", hash = "sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b"},
 ]
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+    {file = "coverage-6.3.1-cp39-cp39-win32.whl", hash = "sha256:2aed4761809640f02e44e16b8b32c1a5dee5e80ea30a0ff0912158bde9c501f2"},
+    {file = "coverage-6.3.1-cp39-cp39-win_amd64.whl", hash = "sha256:9976fb0a5709988778ac9bc44f3d50fccd989987876dfd7716dee28beed0a9fa"},
+    {file = "coverage-6.3.1-pp36.pp37.pp38-none-any.whl", hash = "sha256:463e52616ea687fd323888e86bf25e864a3cc6335a043fad6bbb037dbf49bbe2"},
+    {file = "coverage-6.3.1.tar.gz", hash = "sha256:6c3f6158b02ac403868eea390930ae64e9a9a2a5bbfafefbb920d29258d9f2f8"},
 ]
 distlib = [
     {file = "distlib-0.3.3-py2.py3-none-any.whl", hash = "sha256:c8b54e8454e5bf6237cc84c20e8264c3e991e824ef27e8f1e81049867d861e31"},
@@ -1240,8 +1234,8 @@ pyparsing = [
     {file = "pyparsing-2.4.7.tar.gz", hash = "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1"},
 ]
 pytest = [
-    {file = "pytest-6.2.5-py3-none-any.whl", hash = "sha256:7310f8d27bc79ced999e760ca304d69f6ba6c6649c0b60fb0e04a4a77cacc134"},
-    {file = "pytest-6.2.5.tar.gz", hash = "sha256:131b36680866a76e6781d13f101efb86cf674ebb9762eb70d3082b6f29889e89"},
+    {file = "pytest-7.0.0-py3-none-any.whl", hash = "sha256:42901e6bd4bd4a0e533358a86e848427a49005a3256f657c5c8f8dd35ef137a9"},
+    {file = "pytest-7.0.0.tar.gz", hash = "sha256:dad48ffda394e5ad9aa3b7d7ddf339ed502e5e365b1350e0af65f4a602344b11"},
 ]
 pytest-cov = [
     {file = "pytest-cov-3.0.0.tar.gz", hash = "sha256:e7f0f5b1617d2210a2cabc266dfe2f4c75a8d32fb89eafb7ad9d06f6d076d470"},
diff --git a/pyproject.toml b/pyproject.toml
index b926201..2df185a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ include = ['LICENCE']
 
 [tool.poetry.dependencies]
 python = ">=3.7.1, <4.0"
-pytest = "^5 | ^6"
+pytest = "^5 | ^6 | ^7"
 
 [tool.poetry.dev-dependencies]
 autoflake = "*"