travis: Remove Node 6

RobLoach · web-flow · commit 3719e69b2113 · 2018-10-03T21:49:41.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,6 @@ language: node_js
 sudo: false
 
 node_js:
-  - "6"
   - "7"
   - "8"
   - "9"
