Merge pull request #17 from tk0miya/mypy_types-setuptools

CI: Install types-setuptools to invoke mypy

Author: tk0miya

setup.py

@@ -14,6 +14,7 @@
     'lint': [
         'flake8',
         'mypy',
+        'types-setuptools',
         'docutils-stubs',
     ]
 }