boilerplate: Add Node.js 12 testing

RobLoach · web-flow · commit cd40bce576ba · 2019-05-03T15:57:44.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,6 +6,7 @@ node_js:
   - "9"
   - "10"
   - "11"
+  - "12"
 
 notifications:
   email: false
