[flake8] Add configuration file

Based on the recommendation of black for python

[flake8] Add configuration file
f4b8a049 · Samuel GAIST · 284e05f8 · f4b8a049
Commit f4b8a049 authored 6 years ago by Samuel GAIST
--- a/.flake8
+++ b/.flake8
+[flake8]
+max-line-length = 80
+select = C,E,F,W,B,B950
+ignore = E501