remove travis node4 test

Jeff Escalante · Jeff Escalante · commit e6cb5754ab00 · 2016-07-18T12:54:35.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,6 @@
 sudo: false
 language: node_js
 node_js:
-  - 4
   - 6
 after_script:
   - npm run coveralls
