Update travis to test with minimum node v6
MODIFY
.travis.yml
.travis.yml
@@ -3,7 +3,7 @@ language: node_js
node_js:
# we recommend testing addons with the same minimum supported node version as Ember CLI
# so that your addon works for all apps
- - "4"
+ - "6"
sudo: required
dist: trusty

Update travis to test with minimum node v6