Fixed isort settings

.travis.yml

@@ -9,10 +9,10 @@ install:
     - npm install -g less@2.5.0
 before_script:
     - cd src
+script:
     - flake8 --ignore=E123,F403,F401,N802,C901,W503 .
     - isort -c -rc .
     - python manage.py check
-script:
     - make
     - make compress
     - coverage run -m py.test tests

src/setup.cfg

@@ -9,6 +9,7 @@ combine_as_imports = true
 default_section = THIRDPARTY
 include_trailing_comma = true
 known_first_party = pretix
+known_third_party = versions
 multi_line_output = 5
 not_skip = __init__.py
 skip = make_testdata.py,wsgi.py,bootstrap