Update node versions to run the build on travis

JMPerez · JMPerez · commit 9383122719c3 · 2017-04-18T20:54:11.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,8 @@
 language: node_js
 node_js:
+  - 'node'
+  - '7'
   - '6'
-  - '6.1'
   - '5.11'
 after_success:
   - npm run coveralls
