upgrade to python 3.6 because the 3.3 image was dropped

braver · web-flow · commit 804a20f4e29a · 2019-06-26T10:30:04.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: python
 
 python:
-  - "3.3"
+  - "3.6"
 
 install:
   - pip3 install flake8
