Use Gitlab-CI to enforce PEP8.

.gitlab-ci.yml

+before_script:
+  - apt-get update -qq && apt-get install -y -qq python-virtualenv python3
+  - virtualenv venv -p$(which python3)
+  - . venv/bin/activate
+  - pip install -r requirements.txt
+
+pep8:
+  script:
+    - pep8 wooify

requirements.txt

+pep8==1.7.0