excluded some folder

.travis.yml

@@ -10,4 +10,4 @@ install:
 script:
   - "python secret_key_gen.py"
   - "python manage.py migrate"
-  - "flake8 --count --exclude ./docs,./manage_room/diff_match_patch"
+  - "flake8 --count --exclude ./docs,./manage_room/diff_match_patch,./manage_room/migrations,./manage_chat/migrations"