chore(package): update ember-simple-auth to version 3.0.0

Closes #1762

Author: greenkeeper[bot]

package.json

@@ -90,7 +90,7 @@
     "ember-responsive": "^2.0.5",
     "ember-route-action-helper": "^2.0.0",
     "ember-router-scroll": "^0.4.0",
-    "ember-simple-auth": "^1.2.1",
+    "ember-simple-auth": "^3.0.0",
     "ember-simple-auth-token": "^2.1.0",
     "ember-sinon": "1.0.1",
     "ember-source": "~2.18.0",