Merge pull request #314 from GreatWizard/update-ember-macro-helpers

[BREAKING] Update ember-macro-helpers version, drops Node 6 support

Author: jasonmit

.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
-  - "6"
+  - "8"
 
 sudo: false
 dist: trusty

package.json

@@ -23,7 +23,7 @@
   "dependencies": {
     "ember-cli-babel": "^6.7.2",
     "ember-getowner-polyfill": "^2.2.0",
-    "ember-macro-helpers": "^2.1.0"
+    "ember-macro-helpers": "^4.2.2"
   },
   "devDependencies": {
     "ember-cli": "~2.18.1",
@@ -47,7 +47,7 @@
     "moment-timezone": "^0.5.0"
   },
   "engines": {
-    "node": "^4.5 || 6.* || >= 7.*"
+    "node": "^8.* || >= 10.*"
   },
   "ember-addon": {
     "configPath": "tests/dummy/config"