chore(travis): support npm v3 only

TylorS · TylorS · commit 671d21aa2e9a · 2016-04-29T11:36:16.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,6 @@ language: node_js
 addons: 
   "firefox": "latest"
 node_js:
-  - "4"
   - "5"
 before_script:
   - "export DISPLAY=:99.0"
