fix(travis): remove node 4,5

Alexander Vakhitov · Alexander Vakhitov · commit 03411896585f · 2017-10-17T21:11:43.000+05:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,8 +2,6 @@ language: node_js
 node_js:
   - "7"
   - "6"
-  - "5"
-  - "4"
 cache:
   directories:
     - node_modules
