add pre-commit

mypy.ini

@@ -0,0 +1,19 @@
+[mypy]
+python_version = 3.7
+show_error_codes = true
+follow_imports = silent
+ignore_missing_imports = true
+strict_equality = true
+warn_incomplete_stub = true
+warn_redundant_casts = true
+warn_unused_configs = true
+warn_unused_ignores = true
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+no_implicit_optional = true
+warn_return_any = true
+warn_unreachable = true