Test on Python 3.9-dev to avoid surprises

hugovk · hugovk · commit 9cca0166b725 · 2020-02-24T12:40:21.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,6 +5,7 @@ python:
   - "3.6"
   - "3.5"
   - "2.7"
+  - "3.9-dev"
 
 cache: pip
 
