Update ignore patterns to exclude vendor and migrations explicitly

setup.cfg

@@ -6,7 +6,7 @@ norecursedirs=bin dist docs	htmlcov script hooks node_modules .* {args}
 [flake8]
 ignore = F999,E501,E128,E124,F841
 max-line-length = 100
-exclude = .tox,.git,*/migrations/*,*/static/CACHE/*,docs/*
+exclude = .tox,.git,src/sentry/migrations/*,src/sentry/static/sentry/vendor/*,docs/*
 
 [wheel]
 universal = 1