Remove node v4 from the test matrix

gajus · gajus · commit 991cd9e77517 · 2016-07-04T18:17:57.000+01:00
Node v4 is supported. However, NPM@v2 is breking the ESLint dependency resolution.
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,6 @@ language: node_js
 node_js:
     - 6
     - 5
-    - 4
 notifications:
     email: false
 sudo: false
