diff --git a/poetry.lock b/poetry.lock
index 6ae4526..8164bf1 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -59,7 +59,7 @@ python-versions = "*"
 
 [[package]]
 name = "mypy"
-version = "0.790"
+version = "0.901"
 description = "Optional static typing for Python"
 category = "dev"
 optional = false
@@ -67,11 +67,12 @@ python-versions = ">=3.5"
 
 [package.dependencies]
 mypy-extensions = ">=0.4.3,<0.5.0"
-typed-ast = ">=1.4.0,<1.5.0"
+toml = "*"
 typing-extensions = ">=3.7.4"
 
 [package.extras]
 dmypy = ["psutil (>=4.0)"]
+python2 = ["typed-ast (>=1.4.0,<1.5.0)"]
 
 [[package]]
 name = "mypy-extensions"
@@ -97,19 +98,6 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
-[[package]]
-name = "pydantic"
-version = "1.7.3"
-description = "Data validation and settings management using python 3.6 type hinting"
-category = "main"
-optional = false
-python-versions = ">=3.6"
-
-[package.extras]
-dotenv = ["python-dotenv (>=0.10.4)"]
-email = ["email-validator (>=1.0.3)"]
-typing_extensions = ["typing-extensions (>=3.7.2)"]
-
 [[package]]
 name = "pyflakes"
 version = "2.2.0"
@@ -153,7 +141,7 @@ python-versions = "*"
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "7056c74309d24574cb1939a8538b3b58552bb55913dd8072b960121c6e858772"
+content-hash = "42e7286b5f9ca49943fc41a5ab89da08b52a9b5c68d2354588a8c8e148729a25"
 
 [metadata.files]
 appdirs = [
@@ -176,20 +164,29 @@ mccabe = [
     {file = "mccabe-0.6.1.tar.gz", hash = "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"},
 ]
 mypy = [
-    {file = "mypy-0.790-cp35-cp35m-macosx_10_6_x86_64.whl", hash = "sha256:bd03b3cf666bff8d710d633d1c56ab7facbdc204d567715cb3b9f85c6e94f669"},
-    {file = "mypy-0.790-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:2170492030f6faa537647d29945786d297e4862765f0b4ac5930ff62e300d802"},
-    {file = "mypy-0.790-cp35-cp35m-win_amd64.whl", hash = "sha256:e86bdace26c5fe9cf8cb735e7cedfe7850ad92b327ac5d797c656717d2ca66de"},
-    {file = "mypy-0.790-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:e97e9c13d67fbe524be17e4d8025d51a7dca38f90de2e462243ab8ed8a9178d1"},
-    {file = "mypy-0.790-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:0d34d6b122597d48a36d6c59e35341f410d4abfa771d96d04ae2c468dd201abc"},
-    {file = "mypy-0.790-cp36-cp36m-win_amd64.whl", hash = "sha256:72060bf64f290fb629bd4a67c707a66fd88ca26e413a91384b18db3876e57ed7"},
-    {file = "mypy-0.790-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:eea260feb1830a627fb526d22fbb426b750d9f5a47b624e8d5e7e004359b219c"},
-    {file = "mypy-0.790-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:c614194e01c85bb2e551c421397e49afb2872c88b5830e3554f0519f9fb1c178"},
-    {file = "mypy-0.790-cp37-cp37m-win_amd64.whl", hash = "sha256:0a0d102247c16ce93c97066443d11e2d36e6cc2a32d8ccc1f705268970479324"},
-    {file = "mypy-0.790-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:cf4e7bf7f1214826cf7333627cb2547c0db7e3078723227820d0a2490f117a01"},
-    {file = "mypy-0.790-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:af4e9ff1834e565f1baa74ccf7ae2564ae38c8df2a85b057af1dbbc958eb6666"},
-    {file = "mypy-0.790-cp38-cp38-win_amd64.whl", hash = "sha256:da56dedcd7cd502ccd3c5dddc656cb36113dd793ad466e894574125945653cea"},
-    {file = "mypy-0.790-py3-none-any.whl", hash = "sha256:2842d4fbd1b12ab422346376aad03ff5d0805b706102e475e962370f874a5122"},
-    {file = "mypy-0.790.tar.gz", hash = "sha256:2b21ba45ad9ef2e2eb88ce4aeadd0112d0f5026418324176fd494a6824b74975"},
+    {file = "mypy-0.901-cp35-cp35m-macosx_10_9_x86_64.whl", hash = "sha256:91211acf1485a1db0b1261bc5f9ed450cba3c0dfd8da0a6680e94827591e34d7"},
+    {file = "mypy-0.901-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:c8bc628961cca4335ac7d1f2ed59b7125d9252fe4c78c3d66d30b50162359c99"},
+    {file = "mypy-0.901-cp35-cp35m-manylinux2010_x86_64.whl", hash = "sha256:4a622faa3be76114cdce009f8ec173401494cf9e8f22713e7ae75fee9d906ab3"},
+    {file = "mypy-0.901-cp35-cp35m-win_amd64.whl", hash = "sha256:8183561bfd950e93eeab8379ae5ec65873c856f5b58498d23aa8691f74c86030"},
+    {file = "mypy-0.901-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:da914faaa80c25f463913da6db12adba703822a768f452f29f75b40bb4357139"},
+    {file = "mypy-0.901-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:307a6c047596d768c3d689734307e47a91596eb9dbb67cfdf7d1fd9117b27f13"},
+    {file = "mypy-0.901-cp36-cp36m-manylinux2010_x86_64.whl", hash = "sha256:a85c6759dcc6a9884131fa06a037bd34352aa3947e7f5d9d5a35652cc3a44bcd"},
+    {file = "mypy-0.901-cp36-cp36m-win_amd64.whl", hash = "sha256:9941b685807b60c58020bb67b3217c9df47820dcd00425f55cdf71f31d3c42d9"},
+    {file = "mypy-0.901-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:08cf1f31029612e1008a9432337ca4b1fbac989ff7c8200e2c9ec42705cd4c7b"},
+    {file = "mypy-0.901-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:bc61153eb4df769538bb4a6e1045f59c2e6119339690ec719feeacbfc3809e89"},
+    {file = "mypy-0.901-cp37-cp37m-manylinux2010_x86_64.whl", hash = "sha256:1cd241966a35036f936d4739bd71a1c64e15f02bf7d12bb2815cccfb2993a9de"},
+    {file = "mypy-0.901-cp37-cp37m-win_amd64.whl", hash = "sha256:97be0e8ed116f7f79472a49cf06dd45dd806771142401f684d4f13ee652a63c0"},
+    {file = "mypy-0.901-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:79beb6741df15395908ecc706b3a593a98804c1d5b5b6bd0c5b03b67c7ac03a0"},
+    {file = "mypy-0.901-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:bf347c327c48d963bdef5bf365215d3e98b5fddbe5069fc796cec330e8235a20"},
+    {file = "mypy-0.901-cp38-cp38-manylinux2010_x86_64.whl", hash = "sha256:053b92ebae901fc7954677949049f70133f2f63e3e83dc100225c26d6a46fe95"},
+    {file = "mypy-0.901-cp38-cp38-win_amd64.whl", hash = "sha256:f208cc967e566698c4e30a1f65843fc88d8da05a8693bac8b975417e0aee9ced"},
+    {file = "mypy-0.901-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:c86e3f015bfe7958646825d41c0691c6e5a5cd4015e3409b5c29c18a3c712534"},
+    {file = "mypy-0.901-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:e8577d30daf1b7b6582020f539f76e78ee1ed64a0323b28c8e0333c45db9369f"},
+    {file = "mypy-0.901-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:5ddd8f4096d5fc2e7d7bb3924ac22758862163ad2c1cdc902c4b85568160e90a"},
+    {file = "mypy-0.901-cp39-cp39-manylinux2010_x86_64.whl", hash = "sha256:4b54518e399c3f4dc53380d4252c83276b2e60623cfc5274076eb8aae57572ac"},
+    {file = "mypy-0.901-cp39-cp39-win_amd64.whl", hash = "sha256:7845ad3a31407bfbd64c76d032c16ab546d282930f747023bf07c17b054bebc5"},
+    {file = "mypy-0.901-py3-none-any.whl", hash = "sha256:61b10ba18a01d05fc46adbf4f18b0e92178f6b5fd0f45926ffc2a408b5419728"},
+    {file = "mypy-0.901.tar.gz", hash = "sha256:18753a8bb9bcf031ff10009852bd48d781798ecbccf45be5449892e6af4e3f9f"},
 ]
 mypy-extensions = [
     {file = "mypy_extensions-0.4.3-py2.py3-none-any.whl", hash = "sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d"},
@@ -203,30 +200,6 @@ pycodestyle = [
     {file = "pycodestyle-2.6.0-py2.py3-none-any.whl", hash = "sha256:2295e7b2f6b5bd100585ebcb1f616591b652db8a741695b3d8f5d28bdc934367"},
     {file = "pycodestyle-2.6.0.tar.gz", hash = "sha256:c58a7d2815e0e8d7972bf1803331fb0152f867bd89adf8a01dfd55085434192e"},
 ]
-pydantic = [
-    {file = "pydantic-1.7.3-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:c59ea046aea25be14dc22d69c97bee629e6d48d2b2ecb724d7fe8806bf5f61cd"},
-    {file = "pydantic-1.7.3-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:a4143c8d0c456a093387b96e0f5ee941a950992904d88bc816b4f0e72c9a0009"},
-    {file = "pydantic-1.7.3-cp36-cp36m-manylinux2014_i686.whl", hash = "sha256:d8df4b9090b595511906fa48deda47af04e7d092318bfb291f4d45dfb6bb2127"},
-    {file = "pydantic-1.7.3-cp36-cp36m-manylinux2014_x86_64.whl", hash = "sha256:514b473d264671a5c672dfb28bdfe1bf1afd390f6b206aa2ec9fed7fc592c48e"},
-    {file = "pydantic-1.7.3-cp36-cp36m-win_amd64.whl", hash = "sha256:dba5c1f0a3aeea5083e75db9660935da90216f8a81b6d68e67f54e135ed5eb23"},
-    {file = "pydantic-1.7.3-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:59e45f3b694b05a69032a0d603c32d453a23f0de80844fb14d55ab0c6c78ff2f"},
-    {file = "pydantic-1.7.3-cp37-cp37m-manylinux1_i686.whl", hash = "sha256:5b24e8a572e4b4c18f614004dda8c9f2c07328cb5b6e314d6e1bbd536cb1a6c1"},
-    {file = "pydantic-1.7.3-cp37-cp37m-manylinux2014_i686.whl", hash = "sha256:b2b054d095b6431cdda2f852a6d2f0fdec77686b305c57961b4c5dd6d863bf3c"},
-    {file = "pydantic-1.7.3-cp37-cp37m-manylinux2014_x86_64.whl", hash = "sha256:025bf13ce27990acc059d0c5be46f416fc9b293f45363b3d19855165fee1874f"},
-    {file = "pydantic-1.7.3-cp37-cp37m-win_amd64.whl", hash = "sha256:6e3874aa7e8babd37b40c4504e3a94cc2023696ced5a0500949f3347664ff8e2"},
-    {file = "pydantic-1.7.3-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:e682f6442ebe4e50cb5e1cfde7dda6766fb586631c3e5569f6aa1951fd1a76ef"},
-    {file = "pydantic-1.7.3-cp38-cp38-manylinux1_i686.whl", hash = "sha256:185e18134bec5ef43351149fe34fda4758e53d05bb8ea4d5928f0720997b79ef"},
-    {file = "pydantic-1.7.3-cp38-cp38-manylinux2014_i686.whl", hash = "sha256:f5b06f5099e163295b8ff5b1b71132ecf5866cc6e7f586d78d7d3fd6e8084608"},
-    {file = "pydantic-1.7.3-cp38-cp38-manylinux2014_x86_64.whl", hash = "sha256:24ca47365be2a5a3cc3f4a26dcc755bcdc9f0036f55dcedbd55663662ba145ec"},
-    {file = "pydantic-1.7.3-cp38-cp38-win_amd64.whl", hash = "sha256:d1fe3f0df8ac0f3a9792666c69a7cd70530f329036426d06b4f899c025aca74e"},
-    {file = "pydantic-1.7.3-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:f6864844b039805add62ebe8a8c676286340ba0c6d043ae5dea24114b82a319e"},
-    {file = "pydantic-1.7.3-cp39-cp39-manylinux1_i686.whl", hash = "sha256:ecb54491f98544c12c66ff3d15e701612fc388161fd455242447083350904730"},
-    {file = "pydantic-1.7.3-cp39-cp39-manylinux2014_i686.whl", hash = "sha256:ffd180ebd5dd2a9ac0da4e8b995c9c99e7c74c31f985ba090ee01d681b1c4b95"},
-    {file = "pydantic-1.7.3-cp39-cp39-manylinux2014_x86_64.whl", hash = "sha256:8d72e814c7821125b16f1553124d12faba88e85405b0864328899aceaad7282b"},
-    {file = "pydantic-1.7.3-cp39-cp39-win_amd64.whl", hash = "sha256:475f2fa134cf272d6631072554f845d0630907fce053926ff634cc6bc45bf1af"},
-    {file = "pydantic-1.7.3-py3-none-any.whl", hash = "sha256:38be427ea01a78206bcaf9a56f835784afcba9e5b88fbdce33bbbfbcd7841229"},
-    {file = "pydantic-1.7.3.tar.gz", hash = "sha256:213125b7e9e64713d16d988d10997dabc6a1f73f3991e1ff8e35ebb1409c7dc9"},
-]
 pyflakes = [
     {file = "pyflakes-2.2.0-py2.py3-none-any.whl", hash = "sha256:0d94e0e05a19e57a99444b6ddcf9a6eb2e5c68d3ca1e98e90707af8152c90a92"},
     {file = "pyflakes-2.2.0.tar.gz", hash = "sha256:35b2d75ee967ea93b55750aa9edbbf72813e06a66ba54438df2cfac9e3c27fc8"},
diff --git a/pyproject.toml b/pyproject.toml
index f9cd53f..5b658ec 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ license = "MIT"
 python = "^3.8"
 
 [tool.poetry.dev-dependencies]
-mypy = "^0.790"
+mypy = "^0.901"
 black = "^20.8b1"
 flake8 = "^3.8.4"