diff --git a/poetry.lock b/poetry.lock
index d85adce..9cfdd72 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.*"
 
 [package.extras]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "furo", "sphinx", "pre-commit"]
+dev = ["coverage[toml] (>=5.0.2)", "furo", "hypothesis", "pre-commit", "pympler", "pytest (>=4.3.0)", "six", "sphinx", "zope.interface"]
 docs = ["furo", "sphinx", "zope.interface"]
 tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
-tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
+tests-no-zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
 
 [[package]]
 name = "base58"
@@ -37,7 +37,7 @@ optional = false
 python-versions = ">=3.5"
 
 [package.extras]
-tests = ["pytest (>=4.6)", "pytest-flake8", "pytest-cov", "PyHamcrest (>=2.0.2)", "coveralls", "pytest-benchmark"]
+tests = ["PyHamcrest (>=2.0.2)", "coveralls", "pytest (>=4.6)", "pytest-benchmark", "pytest-cov", "pytest-flake8"]
 
 [[package]]
 name = "beet"
@@ -173,12 +173,12 @@ python-versions = ">=3.6"
 cffi = ">=1.12"
 
 [package.extras]
-docs = ["sphinx (>=1.6.5,!=1.8.0,!=3.1.0,!=3.1.1)", "sphinx-rtd-theme"]
-docstest = ["doc8", "pyenchant (>=1.6.11)", "twine (>=1.12.0)", "sphinxcontrib-spelling (>=4.0.1)"]
+docs = ["sphinx (>=1.6.5,!=1.8.0,!=3.1.0,!=3.1.1)", "sphinx_rtd_theme"]
+docstest = ["doc8", "pyenchant (>=1.6.11)", "sphinxcontrib-spelling (>=4.0.1)", "twine (>=1.12.0)"]
 pep8test = ["black", "flake8", "flake8-import-order", "pep8-naming"]
 sdist = ["setuptools-rust (>=0.11.4)"]
 ssh = ["bcrypt (>=3.1.5)"]
-test = ["pytest (>=6.0)", "pytest-cov", "pytest-subtests", "pytest-xdist", "pretend", "iso8601", "pytz", "hypothesis (>=1.11.4,!=3.79.2)"]
+test = ["hypothesis (>=1.11.4,!=3.79.2)", "iso8601", "pretend", "pytest (>=6.0)", "pytest-cov", "pytest-subtests", "pytest-xdist", "pytz"]
 
 [[package]]
 name = "docutils"
@@ -250,8 +250,8 @@ python-versions = ">=3.6"
 zipp = ">=0.5"
 
 [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)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
+docs = ["jaraco.packaging (>=8.2)", "rst.linker (>=1.9)", "sphinx"]
+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"]
 
 [[package]]
 name = "iniconfig"
@@ -271,16 +271,17 @@ python-versions = "*"
 
 [[package]]
 name = "isort"
-version = "5.8.0"
+version = "5.11.4"
 description = "A Python utility / library to sort Python imports."
 category = "dev"
 optional = false
-python-versions = ">=3.6,<4.0"
+python-versions = ">=3.7.0"
 
 [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 = "jeepney"
@@ -291,7 +292,7 @@ optional = false
 python-versions = ">=3.6"
 
 [package.extras]
-test = ["pytest", "pytest-trio", "pytest-asyncio", "testpath", "trio"]
+test = ["pytest", "pytest-asyncio", "pytest-trio", "testpath", "trio"]
 
 [[package]]
 name = "jinja2"
@@ -322,8 +323,8 @@ pywin32-ctypes = {version = "<0.1.0 || >0.1.0,<0.1.1 || >0.1.1", markers = "sys_
 SecretStorage = {version = ">=3.2", markers = "sys_platform == \"linux\""}
 
 [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)", "pytest-black (>=0.3.7)", "pytest-mypy"]
+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 = "lectern"
@@ -351,11 +352,11 @@ attrs = ">=19,<21"
 mdit-py-plugins = ">=0.2.1,<0.3.0"
 
 [package.extras]
-code_style = ["pre-commit (==2.6)"]
-compare = ["commonmark (>=0.9.1,<0.10.0)", "markdown (>=3.2.2,<3.3.0)", "mistune (>=0.8.4,<0.9.0)", "mistletoe-ebp (>=0.10.0,<0.11.0)", "panflute (>=1.12,<2.0)"]
+code-style = ["pre-commit (==2.6)"]
+compare = ["commonmark (>=0.9.1,<0.10.0)", "markdown (>=3.2.2,<3.3.0)", "mistletoe-ebp (>=0.10.0,<0.11.0)", "mistune (>=0.8.4,<0.9.0)", "panflute (>=1.12,<2.0)"]
 linkify = ["linkify-it-py (>=1.0,<2.0)"]
-rtd = ["myst-nb (>=0.11.1,<0.12.0)", "sphinx-book-theme", "sphinx-panels (>=0.4.0,<0.5.0)", "sphinx-copybutton", "sphinx (>=2,<4)", "pyyaml"]
-testing = ["coverage", "pytest (>=3.6,<4)", "pytest-cov", "pytest-regressions", "pytest-benchmark (>=3.2,<4.0)", "psutil"]
+rtd = ["myst-nb (>=0.11.1,<0.12.0)", "pyyaml", "sphinx (>=2,<4)", "sphinx-book-theme", "sphinx-copybutton", "sphinx-panels (>=0.4.0,<0.5.0)"]
+testing = ["coverage", "psutil", "pytest (>=3.6,<4)", "pytest-benchmark (>=3.2,<4.0)", "pytest-cov", "pytest-regressions"]
 
 [[package]]
 name = "markupsafe"
@@ -377,7 +378,7 @@ python-versions = "~=3.6"
 markdown-it-py = ">=0.5.8,<2.0.0"
 
 [package.extras]
-code_style = ["pre-commit (==2.6)"]
+code-style = ["pre-commit (==2.6)"]
 testing = ["coverage", "pytest (>=3.6,<4)", "pytest-cov", "pytest-regressions"]
 
 [[package]]
@@ -443,7 +444,7 @@ optional = false
 python-versions = "*"
 
 [package.extras]
-testing = ["nose", "coverage"]
+testing = ["coverage", "nose"]
 
 [[package]]
 name = "pluggy"
@@ -579,11 +580,12 @@ requests = ">=2.25,<3"
 semver = ">=2.10,<3"
 tomlkit = ">=0.7.0,<1.0.0"
 twine = ">=3,<4"
+wheel = "*"
 
 [package.extras]
-dev = ["mypy", "tox", "isort", "black"]
+dev = ["black", "isort", "mypy", "tox"]
 docs = ["Sphinx (==1.3.6)"]
-test = ["coverage (>=5,<6)", "pytest (>=5,<6)", "pytest-xdist (>=1,<2)", "pytest-mock (>=2,<3)", "responses (==0.5.0)", "mock (==1.3.0)"]
+test = ["coverage (>=5,<6)", "mock (==1.3.0)", "pytest (>=5,<6)", "pytest-mock (>=2,<3)", "pytest-xdist (>=1,<2)", "responses (==0.5.0)"]
 
 [[package]]
 name = "pywin32-ctypes"
@@ -633,7 +635,7 @@ idna = ">=2.5,<3"
 urllib3 = ">=1.21.1,<1.27"
 
 [package.extras]
-security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)"]
+security = ["cryptography (>=1.3.4)", "pyOpenSSL (>=0.14)"]
 socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
 
 [[package]]
@@ -689,6 +691,19 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
+[[package]]
+name = "setuptools"
+version = "65.6.3"
+description = "Easily download, build, install, upgrade, and uninstall Python packages"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "pygments-github-lexers (==0.0.5)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-favicon", "sphinx-hoverxref (<2)", "sphinx-inline-tabs", "sphinx-notfound-page (==0.8.3)", "sphinx-reredirects", "sphinxcontrib-towncrier"]
+testing = ["build[virtualenv]", "filelock (>=3.4.0)", "flake8 (<5)", "flake8-2020", "ini2toml[lite] (>=0.9)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "pip (>=19.1)", "pip-run (>=8.8)", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)", "pytest-perf", "pytest-timeout", "pytest-xdist", "tomli-w (>=1.0.0)", "virtualenv (>=13.0.0)", "wheel"]
+testing-integration = ["build[virtualenv]", "filelock (>=3.4.0)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "pytest", "pytest-enabler", "pytest-xdist", "tomli", "virtualenv (>=13.0.0)", "wheel"]
+
 [[package]]
 name = "setuptools-scm"
 version = "6.0.1"
@@ -697,6 +712,9 @@ category = "dev"
 optional = false
 python-versions = ">=3.6"
 
+[package.dependencies]
+setuptools = ">=45"
+
 [package.extras]
 toml = ["toml"]
 
@@ -781,9 +799,9 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 
 [package.extras]
-secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
-socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 brotli = ["brotlipy (>=0.6.0)"]
+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]]
 name = "webencodings"
@@ -793,6 +811,17 @@ category = "dev"
 optional = false
 python-versions = "*"
 
+[[package]]
+name = "wheel"
+version = "0.38.4"
+description = "A built-package format for Python"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+test = ["pytest (>=3.0.0)"]
+
 [[package]]
 name = "wrapt"
 version = "1.12.1"
@@ -810,13 +839,13 @@ optional = false
 python-versions = ">=3.6"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=4.6)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "pytest-enabler", "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 (>=1.2.3)", "pytest-cov", "pytest-enabler", "pytest-flake8", "pytest-mypy"]
 
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "f3b9011fa904588443fadfb4238c20ad87ce545f02a2ea216c8a132986f436b3"
+content-hash = "7e07b37ce7746dd35e2c45a90d4f9dcb74437d4921896874054289b02b12c9ba"
 
 [metadata.files]
 appdirs = [
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@@ -920,8 +961,10 @@ cryptography = [
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     {file = "cryptography-3.4.7-pp36-pypy36_pp73-manylinux2010_x86_64.whl", hash = "sha256:26965837447f9c82f1855e0bc8bc4fb910240b6e0d16a664bb722df3b5b06873"},
     {file = "cryptography-3.4.7-pp36-pypy36_pp73-manylinux2014_x86_64.whl", hash = "sha256:eb8cc2afe8b05acbd84a43905832ec78e7b3873fb124ca190f574dca7389a87d"},
+    {file = "cryptography-3.4.7-pp37-pypy37_pp73-macosx_10_10_x86_64.whl", hash = "sha256:b01fd6f2737816cb1e08ed4807ae194404790eac7ad030b34f2ce72b332f5586"},
     {file = "cryptography-3.4.7-pp37-pypy37_pp73-manylinux2010_x86_64.whl", hash = "sha256:7ec5d3b029f5fa2b179325908b9cd93db28ab7b85bb6c1db56b10e0b54235177"},
     {file = "cryptography-3.4.7-pp37-pypy37_pp73-manylinux2014_x86_64.whl", hash = "sha256:ee77aa129f481be46f8d92a1a7db57269a2f23052d5f2433b4621bb457081cc9"},
+    {file = "cryptography-3.4.7-pp37-pypy37_pp73-win_amd64.whl", hash = "sha256:bf40af59ca2465b24e54f671b2de2c59257ddc4f7e5706dbd6930e26823668d3"},
     {file = "cryptography-3.4.7.tar.gz", hash = "sha256:3d10de8116d25649631977cb37da6cbdd2d6fa0e0281d014a5b7d337255ca713"},
 ]
 docutils = [
@@ -960,8 +1003,8 @@ invoke = [
     {file = "invoke-1.5.0.tar.gz", hash = "sha256:f0c560075b5fb29ba14dad44a7185514e94970d1b9d57dcd3723bec5fed92650"},
 ]
 isort = [
-    {file = "isort-5.8.0-py3-none-any.whl", hash = "sha256:2bb1680aad211e3c9944dbce1d4ba09a989f04e238296c87fe2139faa26d655d"},
-    {file = "isort-5.8.0.tar.gz", hash = "sha256:0a943902919f65c5684ac4e0154b1ad4fac6dcaa5d9f3426b732f1c8b5419be6"},
+    {file = "isort-5.11.4-py3-none-any.whl", hash = "sha256:c033fd0edb91000a7f09527fe5c75321878f98322a77ddcc81adbd83724afb7b"},
+    {file = "isort-5.11.4.tar.gz", hash = "sha256:6db30c5ded9815d813932c04c2f85a360bcdd35fed496f4d8f35495ef0a261b6"},
 ]
 jeepney = [
     {file = "jeepney-0.6.0-py3-none-any.whl", hash = "sha256:aec56c0eb1691a841795111e184e13cad504f7703b9a64f63020816afa79a8ae"},
@@ -1116,6 +1159,7 @@ pillow = [
     {file = "Pillow-8.2.0-pp37-pypy37_pp73-manylinux2010_i686.whl", hash = "sha256:aac00e4bc94d1b7813fe882c28990c1bc2f9d0e1aa765a5f2b516e8a6a16a9e4"},
     {file = "Pillow-8.2.0-pp37-pypy37_pp73-manylinux2010_x86_64.whl", hash = "sha256:22fd0f42ad15dfdde6c581347eaa4adb9a6fc4b865f90b23378aa7914895e120"},
     {file = "Pillow-8.2.0-pp37-pypy37_pp73-win32.whl", hash = "sha256:e98eca29a05913e82177b3ba3d198b1728e164869c613d76d0de4bde6768a50e"},
+    {file = "Pillow-8.2.0-pp37-pypy37_pp73-win_amd64.whl", hash = "sha256:8b56553c0345ad6dcb2e9b433ae47d67f95fc23fe28a0bde15a120f25257e291"},
     {file = "Pillow-8.2.0.tar.gz", hash = "sha256:a787ab10d7bb5494e5f76536ac460741788f1fbce851068d73a87ca7c35fc3e1"},
 ]
 pkginfo = [
@@ -1260,6 +1304,10 @@ semver = [
     {file = "semver-2.13.0-py2.py3-none-any.whl", hash = "sha256:ced8b23dceb22134307c1b8abfa523da14198793d9787ac838e70e29e77458d4"},
     {file = "semver-2.13.0.tar.gz", hash = "sha256:fa0fe2722ee1c3f57eac478820c3a5ae2f624af8264cbdf9000c980ff7f75e3f"},
 ]
+setuptools = [
+    {file = "setuptools-65.6.3-py3-none-any.whl", hash = "sha256:57f6f22bde4e042978bcd50176fdb381d7c21a9efa4041202288d3737a0c6a54"},
+    {file = "setuptools-65.6.3.tar.gz", hash = "sha256:a7620757bf984b58deaf32fc8a4577a9bbc0850cf92c20e1ce41c38c19e5fb75"},
+]
 setuptools-scm = [
     {file = "setuptools_scm-6.0.1-py3-none-any.whl", hash = "sha256:c3bd5f701c8def44a5c0bfe8d407bef3f80342217ef3492b951f3777bd2d915c"},
     {file = "setuptools_scm-6.0.1.tar.gz", hash = "sha256:d1925a69cb07e9b29416a275b9fadb009a23c148ace905b2fb220649a6c18e92"},
@@ -1301,6 +1349,10 @@ webencodings = [
     {file = "webencodings-0.5.1-py2.py3-none-any.whl", hash = "sha256:a0af1213f3c2226497a97e2b3aa01a7e4bee4f403f95be16fc9acd2947514a78"},
     {file = "webencodings-0.5.1.tar.gz", hash = "sha256:b36a1c245f2d304965eb4e0a82848379241dc04b865afcc4aab16748587e1923"},
 ]
+wheel = [
+    {file = "wheel-0.38.4-py3-none-any.whl", hash = "sha256:b60533f3f5d530e971d6737ca6d58681ee434818fab630c83a734bb10c083ce8"},
+    {file = "wheel-0.38.4.tar.gz", hash = "sha256:965f5259b566725405b05e7cf774052044b1ed30119b5d586b2703aafe8719ac"},
+]
 wrapt = [
     {file = "wrapt-1.12.1.tar.gz", hash = "sha256:b62ffa81fb85f4332a4f609cab4ac40709470da05643a082ec1eb88e6d9b97d7"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
index 0c2e614..b1e04b7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ beet = ">=0.22.0"
 
 [tool.poetry.dev-dependencies]
 black = "^21.4b0"
-isort = "^5.8.0"
+isort = "^5.11.4"
 rope = "^0.19.0"
 python-semantic-release = "^7.15.3"
 pytest = "^6.2.3"