update ember-cli to ^2.13.1

Author: ro0gr

package.json

@@ -45,7 +45,7 @@
     "chai": "^3.0.0",
     "chai-fs": "^1.0.0",
     "ember-ajax": "^2.4.1",
-    "ember-cli": "2.12.0-beta.1",
+    "ember-cli": "^2.13.1",
     "ember-cli-addon-tests": "^0.7.0",
     "ember-cli-dependency-checker": "^1.3.0",
     "ember-cli-eslint": "^3.0.2",