Updating Travis to use bionic image

aaltat · web-flow · commit 7f28db2b5d7b · 2019-09-06T07:49:09.000+03:00
To move Python 3.7 and 3.8
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: python
 sudo: required
-dist: trusty
+dist: bionic
 env:
   global:
     - JYTHON=false
