Only run Travis on the master branch [skip ci]

SpaceK33z · web-flow · commit c82c1eb0f0f6 · 2017-01-28T19:59:15.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,4 +1,7 @@
 sudo: false
+branches:
+  only:
+    - master
 language: node_js
 node_js:
   - "6"
