chore: Add Node.js 12 to Travis config (optimizely#369)

mjc1283 · web-flow · commit 8592fc92fd83 · 2019-11-14T13:55:11.000-08:00
Summary:

Add Node.js 12 to versions in Travis config file

Test plan:

Existing tests
diff --git a/.travis.yml b/.travis.yml
@@ -4,6 +4,7 @@ node_js:
 - '8'
 - '9'
 - '10'
+- '12'
 branches:
   only:
   - master

-Original file line number
+Diff line change
 - '8'
 - '9'
 - '10'
 +- '12'
 branches:
   only:
   - master