Merge blake8 conf to tox.ini

.flake8

@@ -1 +0,0 @@
-select = Q0

tox.ini

@@ -45,3 +45,10 @@ commands =
 deps = {[testenv]deps}
 commands =
     codespell --write-changes
+
+[flake8]
+max-line-length = 100
+extend-ignore = E203,E501,W503
+exclude = *.*/*
+multiline-quotes = '''
+docstring-quotes = '''