diff --git a/poetry.lock b/poetry.lock
index c38316f..6c25e1b 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,11 +1,3 @@
-[[package]]
-name = "alabaster"
-version = "0.7.12"
-description = "A configurable sidebar-enabled Sphinx theme"
-category = "dev"
-optional = false
-python-versions = "*"
-
 [[package]]
 name = "appdirs"
 version = "1.4.4"
@@ -25,17 +17,6 @@ python-versions = ">=3.5"
 [package.extras]
 tests = ["pytest", "pytest-asyncio"]
 
-[[package]]
-name = "babel"
-version = "2.8.0"
-description = "Internationalization utilities"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[package.dependencies]
-pytz = ">=2015.7"
-
 [[package]]
 name = "black"
 version = "20.8b1"
@@ -59,22 +40,6 @@ typing-extensions = ">=3.7.4"
 colorama = ["colorama (>=0.4.3)"]
 d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
 
-[[package]]
-name = "certifi"
-version = "2020.6.20"
-description = "Python package for providing Mozilla's CA Bundle."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "chardet"
-version = "3.0.4"
-description = "Universal encoding detector for Python 2 and 3"
-category = "dev"
-optional = false
-python-versions = "*"
-
 [[package]]
 name = "click"
 version = "7.1.2"
@@ -83,24 +48,16 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
-[[package]]
-name = "colorama"
-version = "0.4.4"
-description = "Cross-platform colored terminal text."
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-
 [[package]]
 name = "coverage"
-version = "5.3"
+version = "6.1.2"
 description = "Code coverage measurement for Python"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
+python-versions = ">=3.6"
 
 [package.extras]
-toml = ["toml"]
+toml = ["tomli"]
 
 [[package]]
 name = "dataclasses"
@@ -127,52 +84,6 @@ sqlparse = ">=0.2.2"
 argon2 = ["argon2-cffi (>=16.1.0)"]
 bcrypt = ["bcrypt"]
 
-[[package]]
-name = "docutils"
-version = "0.16"
-description = "Docutils -- Python Documentation Utilities"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-
-[[package]]
-name = "idna"
-version = "2.10"
-description = "Internationalized Domain Names in Applications (IDNA)"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[[package]]
-name = "imagesize"
-version = "1.2.0"
-description = "Getting image size from png/jpeg/jpeg2000/gif file"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[[package]]
-name = "jinja2"
-version = "2.11.2"
-description = "A very fast and expressive template engine."
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-
-[package.dependencies]
-MarkupSafe = ">=0.23"
-
-[package.extras]
-i18n = ["Babel (>=0.8)"]
-
-[[package]]
-name = "markupsafe"
-version = "1.1.1"
-description = "Safely add untrusted strings to HTML/XML markup."
-category = "dev"
-optional = false
-python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
-
 [[package]]
 name = "mypy-extensions"
 version = "0.4.3"
@@ -181,18 +92,6 @@ category = "dev"
 optional = false
 python-versions = "*"
 
-[[package]]
-name = "packaging"
-version = "20.4"
-description = "Core utilities for Python packages"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[package.dependencies]
-pyparsing = ">=2.0.2"
-six = "*"
-
 [[package]]
 name = "pathspec"
 version = "0.8.0"
@@ -201,22 +100,6 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
-[[package]]
-name = "pygments"
-version = "2.7.2"
-description = "Pygments is a syntax highlighting package written in Python."
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
-[[package]]
-name = "pyparsing"
-version = "2.4.7"
-description = "Python parsing module"
-category = "dev"
-optional = false
-python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-
 [[package]]
 name = "pytz"
 version = "2020.4"
@@ -233,142 +116,6 @@ category = "dev"
 optional = false
 python-versions = "*"
 
-[[package]]
-name = "requests"
-version = "2.24.0"
-description = "Python HTTP for Humans."
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-
-[package.dependencies]
-certifi = ">=2017.4.17"
-chardet = ">=3.0.2,<4"
-idna = ">=2.5,<3"
-urllib3 = ">=1.21.1,<1.25.0 || >1.25.0,<1.25.1 || >1.25.1,<1.26"
-
-[package.extras]
-security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)"]
-socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
-
-[[package]]
-name = "six"
-version = "1.15.0"
-description = "Python 2 and 3 compatibility utilities"
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
-
-[[package]]
-name = "snowballstemmer"
-version = "2.0.0"
-description = "This package provides 26 stemmers for 25 languages generated from Snowball algorithms."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "sphinx"
-version = "3.3.0"
-description = "Python documentation generator"
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
-[package.dependencies]
-alabaster = ">=0.7,<0.8"
-babel = ">=1.3"
-colorama = {version = ">=0.3.5", markers = "sys_platform == \"win32\""}
-docutils = ">=0.12"
-imagesize = "*"
-Jinja2 = ">=2.3"
-packaging = "*"
-Pygments = ">=2.0"
-requests = ">=2.5.0"
-snowballstemmer = ">=1.1"
-sphinxcontrib-applehelp = "*"
-sphinxcontrib-devhelp = "*"
-sphinxcontrib-htmlhelp = "*"
-sphinxcontrib-jsmath = "*"
-sphinxcontrib-qthelp = "*"
-sphinxcontrib-serializinghtml = "*"
-
-[package.extras]
-docs = ["sphinxcontrib-websupport"]
-lint = ["flake8 (>=3.5.0)", "flake8-import-order", "mypy (>=0.790)", "docutils-stubs"]
-test = ["pytest", "pytest-cov", "html5lib", "typed-ast", "cython"]
-
-[[package]]
-name = "sphinxcontrib-applehelp"
-version = "1.0.2"
-description = "sphinxcontrib-applehelp is a sphinx extension which outputs Apple help books"
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
-[package.extras]
-lint = ["flake8", "mypy", "docutils-stubs"]
-test = ["pytest"]
-
-[[package]]
-name = "sphinxcontrib-devhelp"
-version = "1.0.2"
-description = "sphinxcontrib-devhelp is a sphinx extension which outputs Devhelp document."
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
-[package.extras]
-lint = ["flake8", "mypy", "docutils-stubs"]
-test = ["pytest"]
-
-[[package]]
-name = "sphinxcontrib-htmlhelp"
-version = "1.0.3"
-description = "sphinxcontrib-htmlhelp is a sphinx extension which renders HTML help files"
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
-[package.extras]
-lint = ["flake8", "mypy", "docutils-stubs"]
-test = ["pytest", "html5lib"]
-
-[[package]]
-name = "sphinxcontrib-jsmath"
-version = "1.0.1"
-description = "A sphinx extension which renders display math in HTML via JavaScript"
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
-[package.extras]
-test = ["pytest", "flake8", "mypy"]
-
-[[package]]
-name = "sphinxcontrib-qthelp"
-version = "1.0.3"
-description = "sphinxcontrib-qthelp is a sphinx extension which outputs QtHelp document."
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
-[package.extras]
-lint = ["flake8", "mypy", "docutils-stubs"]
-test = ["pytest"]
-
-[[package]]
-name = "sphinxcontrib-serializinghtml"
-version = "1.1.4"
-description = "sphinxcontrib-serializinghtml is a sphinx extension which outputs \"serialized\" HTML files (json and pickle)."
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
-[package.extras]
-lint = ["flake8", "mypy", "docutils-stubs"]
-test = ["pytest"]
-
 [[package]]
 name = "sqlparse"
 version = "0.4.1"
@@ -401,29 +148,12 @@ category = "dev"
 optional = false
 python-versions = "*"
 
-[[package]]
-name = "urllib3"
-version = "1.25.11"
-description = "HTTP library with thread-safe connection pooling, file post, and more."
-category = "dev"
-optional = false
-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"]
-socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
-
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6"
-content-hash = "10b71b6aabac6b94c397eaea6eadab39ef443c1b3746ad42dd75350e277c876f"
+content-hash = "05e35865d96c56e51368fcc7594fd7186aa664b1cc0917793ec69012dfd9629b"
 
 [metadata.files]
-alabaster = [
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-    {file = "alabaster-0.7.12.tar.gz", hash = "sha256:a661d72d58e6ea8a57f7a86e37d86716863ee5e92788398526d58b26a4e4dc02"},
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 appdirs = [
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@@ -432,64 +162,61 @@ asgiref = [
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 ]
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-    {file = "Babel-2.8.0.tar.gz", hash = "sha256:1aac2ae2d0d8ea368fa90906567f5c08463d98ade155c0c4bfedd6a0f7160e38"},
-]
 black = [
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-    {file = "Pygments-2.7.2.tar.gz", hash = "sha256:381985fcc551eb9d37c52088a32914e00517e57f4a21609f48141ba08e193fa0"},
-]
-pyparsing = [
-    {file = "pyparsing-2.4.7-py2.py3-none-any.whl", hash = "sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b"},
-    {file = "pyparsing-2.4.7.tar.gz", hash = "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1"},
-]
 pytz = [
     {file = "pytz-2020.4-py2.py3-none-any.whl", hash = "sha256:5c55e189b682d420be27c6995ba6edce0c0a77dd67bfbe2ae6607134d5851ffd"},
     {file = "pytz-2020.4.tar.gz", hash = "sha256:3e6b7dd2d1e0a59084bcee14a17af60c5c562cdc16d828e8eba2e683d3a7e268"},
@@ -619,46 +283,6 @@ regex = [
     {file = "regex-2020.10.28-cp39-cp39-win_amd64.whl", hash = "sha256:654c1635f2313d0843028487db2191530bca45af61ca85d0b16555c399625b0e"},
     {file = "regex-2020.10.28.tar.gz", hash = "sha256:dd3e6547ecf842a29cf25123fbf8d2461c53c8d37aa20d87ecee130c89b7079b"},
 ]
-requests = [
-    {file = "requests-2.24.0-py2.py3-none-any.whl", hash = "sha256:fe75cc94a9443b9246fc7049224f75604b113c36acb93f87b80ed42c44cbb898"},
-    {file = "requests-2.24.0.tar.gz", hash = "sha256:b3559a131db72c33ee969480840fff4bb6dd111de7dd27c8ee1f820f4f00231b"},
-]
-six = [
-    {file = "six-1.15.0-py2.py3-none-any.whl", hash = "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"},
-    {file = "six-1.15.0.tar.gz", hash = "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259"},
-]
-snowballstemmer = [
-    {file = "snowballstemmer-2.0.0-py2.py3-none-any.whl", hash = "sha256:209f257d7533fdb3cb73bdbd24f436239ca3b2fa67d56f6ff88e86be08cc5ef0"},
-    {file = "snowballstemmer-2.0.0.tar.gz", hash = "sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52"},
-]
-sphinx = [
-    {file = "Sphinx-3.3.0-py3-none-any.whl", hash = "sha256:3abdb2c57a65afaaa4f8573cbabd5465078eb6fd282c1e4f87f006875a7ec0c7"},
-    {file = "Sphinx-3.3.0.tar.gz", hash = "sha256:1c21e7c5481a31b531e6cbf59c3292852ccde175b504b00ce2ff0b8f4adc3649"},
-]
-sphinxcontrib-applehelp = [
-    {file = "sphinxcontrib-applehelp-1.0.2.tar.gz", hash = "sha256:a072735ec80e7675e3f432fcae8610ecf509c5f1869d17e2eecff44389cdbc58"},
-    {file = "sphinxcontrib_applehelp-1.0.2-py2.py3-none-any.whl", hash = "sha256:806111e5e962be97c29ec4c1e7fe277bfd19e9652fb1a4392105b43e01af885a"},
-]
-sphinxcontrib-devhelp = [
-    {file = "sphinxcontrib-devhelp-1.0.2.tar.gz", hash = "sha256:ff7f1afa7b9642e7060379360a67e9c41e8f3121f2ce9164266f61b9f4b338e4"},
-    {file = "sphinxcontrib_devhelp-1.0.2-py2.py3-none-any.whl", hash = "sha256:8165223f9a335cc1af7ffe1ed31d2871f325254c0423bc0c4c7cd1c1e4734a2e"},
-]
-sphinxcontrib-htmlhelp = [
-    {file = "sphinxcontrib-htmlhelp-1.0.3.tar.gz", hash = "sha256:e8f5bb7e31b2dbb25b9cc435c8ab7a79787ebf7f906155729338f3156d93659b"},
-    {file = "sphinxcontrib_htmlhelp-1.0.3-py2.py3-none-any.whl", hash = "sha256:3c0bc24a2c41e340ac37c85ced6dafc879ab485c095b1d65d2461ac2f7cca86f"},
-]
-sphinxcontrib-jsmath = [
-    {file = "sphinxcontrib-jsmath-1.0.1.tar.gz", hash = "sha256:a9925e4a4587247ed2191a22df5f6970656cb8ca2bd6284309578f2153e0c4b8"},
-    {file = "sphinxcontrib_jsmath-1.0.1-py2.py3-none-any.whl", hash = "sha256:2ec2eaebfb78f3f2078e73666b1415417a116cc848b72e5172e596c871103178"},
-]
-sphinxcontrib-qthelp = [
-    {file = "sphinxcontrib-qthelp-1.0.3.tar.gz", hash = "sha256:4c33767ee058b70dba89a6fc5c1892c0d57a54be67ddd3e7875a18d14cba5a72"},
-    {file = "sphinxcontrib_qthelp-1.0.3-py2.py3-none-any.whl", hash = "sha256:bd9fc24bcb748a8d51fd4ecaade681350aa63009a347a8c14e637895444dfab6"},
-]
-sphinxcontrib-serializinghtml = [
-    {file = "sphinxcontrib-serializinghtml-1.1.4.tar.gz", hash = "sha256:eaa0eccc86e982a9b939b2b82d12cc5d013385ba5eadcc7e4fed23f4405f77bc"},
-    {file = "sphinxcontrib_serializinghtml-1.1.4-py2.py3-none-any.whl", hash = "sha256:f242a81d423f59617a8e5cf16f5d4d74e28ee9a66f9e5b637a18082991db5a9a"},
-]
 sqlparse = [
     {file = "sqlparse-0.4.1-py3-none-any.whl", hash = "sha256:017cde379adbd6a1f15a61873f43e8274179378e95ef3fede90b5aa64d304ed0"},
     {file = "sqlparse-0.4.1.tar.gz", hash = "sha256:0f91fd2e829c44362cbcfab3e9ae12e22badaa8a29ad5ff599f9ec109f0454e8"},
@@ -704,7 +328,3 @@ typing-extensions = [
     {file = "typing_extensions-3.7.4.3-py3-none-any.whl", hash = "sha256:7cb407020f00f7bfc3cb3e7881628838e69d8f3fcab2f64742a5e76b2f841918"},
     {file = "typing_extensions-3.7.4.3.tar.gz", hash = "sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c"},
 ]
-urllib3 = [
-    {file = "urllib3-1.25.11-py2.py3-none-any.whl", hash = "sha256:f5321fbe4bf3fefa0efd0bfe7fb14e90909eb62a48ccda331726b4319897dd5e"},
-    {file = "urllib3-1.25.11.tar.gz", hash = "sha256:8d7eaa5a82a1cac232164990f04874c594c9453ec55eef02eab885aa02fc17a2"},
-]
diff --git a/pyproject.toml b/pyproject.toml
index 8533bfa..dbee590 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -58,5 +58,5 @@ python = "^3.6"
 Django = ">1.10"
 
 [tool.poetry.dev-dependencies]
-coverage = "^5.3"
+coverage = "^6.1"
 black = "^20.8b1"