chore(package): update ember-decorators to version 3.0.2

Closes #79

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
     "ember-cli-shims": "^1.2.0",
     "ember-cli-sri": "^2.1.0",
     "ember-cli-uglify": "^2.0.0",
-    "ember-decorators": "^2.4.1",
+    "ember-decorators": "^3.0.2",
     "ember-disable-prototype-extensions": "^1.1.2",
     "ember-export-application-global": "^2.0.0",
     "ember-load-initializers": "^1.1.0",