diff --git a/poetry.lock b/poetry.lock
index d7fcfc3..e059869 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -23,10 +23,10 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.extras]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit"]
-docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
-tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface"]
-tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins"]
+dev = ["coverage[toml] (>=5.0.2)", "furo", "hypothesis", "mypy", "pre-commit", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "six", "sphinx", "sphinx-notfound-page", "zope.interface"]
+docs = ["furo", "sphinx", "sphinx-notfound-page", "zope.interface"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "mypy", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "six", "zope.interface"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "mypy", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "six"]
 
 [[package]]
 name = "backports.entry-points-selectable"
@@ -40,8 +40,8 @@ python-versions = ">=2.7"
 importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=4.6)", "pytest-flake8", "pytest-cov", "pytest-black (>=0.3.7)", "pytest-mypy", "pytest-checkdocs (>=2.4)", "pytest-enabler (>=1.0.1)"]
+docs = ["jaraco.packaging (>=8.2)", "rst.linker (>=1.9)", "sphinx"]
+testing = ["pytest (>=4.6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-flake8", "pytest-mypy"]
 
 [[package]]
 name = "bandit"
@@ -138,6 +138,9 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 
+[package.dependencies]
+toml = {version = "*", optional = true, markers = "extra == \"toml\""}
+
 [package.extras]
 toml = ["toml"]
 
@@ -291,9 +294,9 @@ typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+docs = ["jaraco.packaging (>=8.2)", "rst.linker (>=1.9)", "sphinx"]
 perf = ["ipython"]
-testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
+testing = ["flufl.flake8", "importlib-resources (>=1.3)", "packaging", "pep517", "pyfakefs", "pytest (>=4.6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-flake8", "pytest-mypy", "pytest-perf (>=0.9.2)"]
 
 [[package]]
 name = "iniconfig"
@@ -312,10 +315,10 @@ optional = false
 python-versions = ">=3.6.1,<4.0"
 
 [package.extras]
-pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
-requirements_deprecated_finder = ["pipreqs", "pip-api"]
 colors = ["colorama (>=0.4.3,<0.5.0)"]
+pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
 plugins = ["setuptools"]
+requirements_deprecated_finder = ["pip-api", "pipreqs"]
 
 [[package]]
 name = "markdownify"
@@ -502,19 +505,18 @@ testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xm
 
 [[package]]
 name = "pytest-cov"
-version = "2.12.1"
+version = "4.0.0"
 description = "Pytest plugin for measuring coverage."
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.6"
 
 [package.dependencies]
-coverage = ">=5.2.1"
+coverage = {version = ">=5.2.1", extras = ["toml"]}
 pytest = ">=4.6"
-toml = "*"
 
 [package.extras]
-testing = ["fields", "hunter", "process-tests", "six", "pytest-xdist", "virtualenv"]
+testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtualenv"]
 
 [[package]]
 name = "pytest-datadir"
@@ -582,15 +584,15 @@ url-normalize = ">=1.4,<2.0"
 urllib3 = ">=1.25.5,<2.0.0"
 
 [package.extras]
+all = ["boto3 (>=1.15,<2.0)", "botocore (>=1.18,<2.0)", "itsdangerous (>=2.0,<3.0)", "pymongo (>=3.0,<4.0)", "pyyaml (>=5.4)", "redis (>=3.0,<4.0)", "ujson (>=4.0)"]
+bson = ["bson (>=0.5)"]
+docs = ["furo (>=2021.8.11-beta.42)", "linkify-it-py (>=1.0.1,<2.0.0)", "myst-parser (>=0.15.1,<0.16.0)", "sphinx (==4.1.2)", "sphinx-autodoc-typehints (>=1.11,<2.0)", "sphinx-automodapi (>=0.13,<0.14)", "sphinx-copybutton (>=0.3,<0.5)", "sphinx-inline-tabs (>=2021.4.11-beta.9,<2022.0.0)", "sphinx-panels (>=0.6,<0.7)", "sphinxcontrib-apidoc (>=0.3,<0.4)"]
 dynamodb = ["boto3 (>=1.15,<2.0)", "botocore (>=1.18,<2.0)"]
-all = ["boto3 (>=1.15,<2.0)", "botocore (>=1.18,<2.0)", "pymongo (>=3.0,<4.0)", "redis (>=3.0,<4.0)", "itsdangerous (>=2.0,<3.0)", "pyyaml (>=5.4)", "ujson (>=4.0)"]
+json = ["ujson (>=4.0)"]
 mongodb = ["pymongo (>=3.0,<4.0)"]
 redis = ["redis (>=3.0,<4.0)"]
-bson = ["bson (>=0.5)"]
 security = ["itsdangerous (>=2.0,<3.0)"]
 yaml = ["pyyaml (>=5.4)"]
-json = ["ujson (>=4.0)"]
-docs = ["furo (>=2021.8.11-beta.42)", "linkify-it-py (>=1.0.1,<2.0.0)", "myst-parser (>=0.15.1,<0.16.0)", "sphinx (==4.1.2)", "sphinx-autodoc-typehints (>=1.11,<2.0)", "sphinx-automodapi (>=0.13,<0.14)", "sphinx-copybutton (>=0.3,<0.5)", "sphinx-inline-tabs (>=2021.4.11-beta.9,<2022.0.0)", "sphinx-panels (>=0.6,<0.7)", "sphinxcontrib-apidoc (>=0.3,<0.4)"]
 
 [[package]]
 name = "rich"
@@ -662,9 +664,9 @@ optional = false
 python-versions = "*"
 
 [package.extras]
-build = ["setuptools-git", "wheel", "twine"]
-docs = ["sphinx", "zope.component", "sybil", "twisted", "mock", "django (<2)", "django"]
-test = ["pytest (>=3.6)", "pytest-cov", "pytest-django", "zope.component", "sybil", "twisted", "mock", "django (<2)", "django"]
+build = ["setuptools-git", "twine", "wheel"]
+docs = ["django", "django (<2)", "mock", "sphinx", "sybil", "twisted", "zope.component"]
+test = ["django", "django (<2)", "mock", "pytest (>=3.6)", "pytest-cov", "pytest-django", "sybil", "twisted", "zope.component"]
 
 [[package]]
 name = "textual"
@@ -723,7 +725,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 
 [package.extras]
 brotli = ["brotlipy (>=0.6.0)"]
-secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
+secure = ["certifi", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "ipaddress", "pyOpenSSL (>=0.14)"]
 socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
 [[package]]
@@ -744,7 +746,7 @@ six = ">=1.9.0,<2"
 
 [package.extras]
 docs = ["proselint (>=0.10.2)", "sphinx (>=3)", "sphinx-argparse (>=0.2.5)", "sphinx-rtd-theme (>=0.4.3)", "towncrier (>=19.9.0rc1)"]
-testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)", "packaging (>=20.0)"]
+testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "packaging (>=20.0)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)"]
 
 [[package]]
 name = "zipp"
@@ -755,8 +757,8 @@ optional = false
 python-versions = ">=3.6"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
+docs = ["jaraco.packaging (>=8.2)", "rst.linker (>=1.9)", "sphinx"]
+testing = ["func-timeout", "jaraco.itertools", "pytest (>=4.6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-flake8", "pytest-mypy"]
 
 [extras]
 dev = []
@@ -996,8 +998,8 @@ pytest = [
     {file = "pytest-6.2.5.tar.gz", hash = "sha256:131b36680866a76e6781d13f101efb86cf674ebb9762eb70d3082b6f29889e89"},
 ]
 pytest-cov = [
-    {file = "pytest-cov-2.12.1.tar.gz", hash = "sha256:261ceeb8c227b726249b376b8526b600f38667ee314f910353fa318caa01f4d7"},
-    {file = "pytest_cov-2.12.1-py2.py3-none-any.whl", hash = "sha256:261bb9e47e65bd099c89c3edf92972865210c36813f80ede5277dceb77a4a62a"},
+    {file = "pytest-cov-4.0.0.tar.gz", hash = "sha256:996b79efde6433cdbd0088872dbc5fb3ed7fe1578b68cdbba634f14bb8dd0470"},
+    {file = "pytest_cov-4.0.0-py3-none-any.whl", hash = "sha256:2feb1b751d66a8bd934e5edfa2e961d11309dc37b73b0eabe73b5945fee20f6b"},
 ]
 pytest-datadir = [
     {file = "pytest-datadir-1.3.1.tar.gz", hash = "sha256:d3af1e738df87515ee509d6135780f25a15959766d9c2b2dbe02bf4fb979cb18"},