Revert E501 flake ignore

Author: vlad-perevezentsev

.flake8

@@ -3,6 +3,8 @@ extend-ignore =
     # whitespace before ':' (currently conflicts with black formatting):
     E203,
     # line too long (in docstrings):
+    E501,
+    # ‘from module import *’ used; unable to detect undefined names:
     F403,
     # name may be undefined, or defined from star imports: module:
     F405,