use Ubuntu 16.04 (Xenial) image (#2170)

Feiyang1 · web-flow · commit d0bb1b152cc0 · 2019-09-11T12:22:05.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -24,7 +24,7 @@ before_script:
   - yarn build
 
 # Misc Addons/Configs
-dist: trusty
+dist: xenial
 sudo: required
 addons:
   firefox: "66.0"
