Cleanup: mypy.ini reduction (#633)

mypy.ini

@@ -1,44 +1,15 @@
 [mypy]
-python_version=3.7
-
-show_column_numbers=True
-show_error_codes=True
-
-# NOTE: ideally we'd have these all be set to True, but that requires a decent
-# number of changes
-disallow_any_unimported=False
-disallow_any_expr=False
-disallow_any_decorated=False
-disallow_any_explicit=False
-disallow_any_generics=True
-disallow_subclassing_any=False  # note: currently only required for templates/scraper.py
-
-disallow_untyped_calls=False
-disallow_untyped_defs=True
-disallow_incomplete_defs=True
-check_untyped_defs=False
-disallow_untyped_decorators=True
-
-no_implicit_optional=True
-strict_optional=True
-
-warn_redundant_casts=True
-warn_unused_ignores=True
-warn_no_return=True
-warn_return_any=False
-warn_unreachable=False
-
-strict_equality=True
-ignore_missing_imports=True
 
 [mypy-recipe_scrapers.*]
 disable_error_code = union-attr
 
 [mypy-tests.*]
-disallow_untyped_defs=False
+disallow_untyped_defs = false
+
+# Third-party libraries
 
-[mypy-setuptools.*]
-ignore_missing_imports=True
+[mypy-isodate]
+ignore_missing_imports = true
 
-[mypy-extruct.*]
-ignore_missing_imports=True
+[mypy-extruct]
+ignore_missing_imports = true