use node 7 in tests

maxgalbu · maxgalbu · commit 22df85a0be0b · 2018-03-14T17:24:44.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,8 @@
 dist: trusty
 sudo: false
 language: node_js
+node_js:
+  - "7"
 
 addons:
   firefox: latest
