CI: Try to run codechecks.

Andreas Albrecht · Andreas Albrecht · commit 434e0b3e9043 · 2019-10-20T18:01:32.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -14,6 +14,12 @@ matrix:
     - python: 3.7
       dist: xenial
       sudo: true
+    - stage: codecheck
+      python: 3.7
+      install:
+        - pip install flake8
+      script:
+        - flake8 sqlparse
 
 install:
   - pip install -Uq pytest pytest-cov codecov
