Add typing stubs for mypy checks

Author: goodmami

noxfile.py

@@ -3,8 +3,7 @@
 
 @nox.session
 def lint(session):
-    session.install('flake8', 'mypy')
-    session.install('.')
+    session.install('.[test]')
     session.run('flake8', '--max-line-length', '88', 'wn')
     session.run('mypy', 'wn')
 

pyproject.toml

@@ -43,6 +43,9 @@ test = [
     "mypy",
     "flake8",
     "nox",
+    # typing stubs
+    'types-requests',
+    'types-toml',
 ]
 doc = [
     "sphinx>=3.5,<4",