Test on Python 3.9-dev to avoid surprises

hugovk · hugovk · commit 145035bfeeb1 · 2020-02-26T15:34:07.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,6 +7,7 @@ python:
   - "3.6"
   - "3.5"
   - "2.7"
+  - "3.9-dev"
 
 cache: pip
 
