Ignore C901 (too complex) flake8 warnings

setup.cfg

@@ -4,7 +4,7 @@ addopts=--tb=native -p no:doctest
 norecursedirs=bin dist docs	htmlcov script hooks node_modules .* {args}
 
 [flake8]
-ignore = F999,E501,E128,E124,E402,W503,E731
+ignore = F999,E501,E128,E124,E402,W503,E731,C901
 max-line-length = 100
 exclude = .tox,.git,*/migrations/*,node_modules/*,src/sentry/static/sentry/vendor/*,docs/*