Update travis node js env version from 0.10 to 4

Philipp Alferov · Philipp Alferov · commit 2525a1f15e27 · 2018-08-20T15:32:30.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,6 +7,7 @@ notifications:
   email: false
 node_js:
   - 'stable'
+  - '4'
 branches:
   except:
     - "/^v\\d+\\.\\d+\\.\\d+$/"
