Update .travis.yml

wannaphong · web-flow · commit 2de68e90d869 · 2019-07-02T10:28:07.000+07:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,7 @@
 # This file will be regenerated if you run travis_pypi_setup.py
 
 language: python
+dist: bionic
 python:
   - "3.6"
 
