Update ember-cli

Author: LevelbossMike

package.json

@@ -12,14 +12,14 @@
     "autotest": "node node_modules/mocha/bin/mocha --watch --reporter spec tests/**/*-test.js"
   },
   "engines": {
-    "node": ">= 0.10.0"
+    "node": "6.* || >= 8.*"
   },
   "author": "",
   "license": "MIT",
   "devDependencies": {
     "chai": "^3.0.0",
     "chai-as-promised": "^6.0.0",
-    "ember-cli": "^2.12.0",
+    "ember-cli": "^3.1.0",
     "ember-cli-release": "^1.0.0-beta.2",
     "eslint": "^3.18.0",
     "github": "^9.2.0",