Remove obsolete ember-fetch dependency

Author: mansona

package.json

@@ -102,7 +102,6 @@
     "ember-error-route": "0.2.0",
     "ember-event-helpers": "0.1.1",
     "ember-exam": "9.1.0",
-    "ember-fetch": "8.1.2",
     "ember-inflector": "6.0.0",
     "ember-keyboard": "9.0.1",
     "ember-link": "3.3.0",