upgrade to ubuntu bionic for python3.7 support

s1113950 · s1113950 · commit 070fde16f3b5 · 2020-04-24T14:22:16.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 sudo: required
-dist: trusty
+dist: bionic
 
 notifications:
   email: false
