Update node versions in travis config

kunalkapadia · kunalkapadia · commit f1bd2d74a1de · 2016-10-26T19:13:54.000+05:30
Closes #122
diff --git a/.travis.yml b/.travis.yml
@@ -1,7 +1,7 @@
 language: node_js
 node_js:
-  - "4.6"
-  - "6.8"
+  - "6.9"
+  - "7.0"
 services:
   - mongodb
 cache:
