Update to published ember-cli 6.3

Author: kategengler

package.json

@@ -127,7 +127,7 @@
     "babel-plugin-ember-template-compilation": "^2.1.1",
     "dag-map": "^2.0.2",
     "decorator-transforms": "2.0.0",
-    "ember-cli": "^6.3.0-beta.3",
+    "ember-cli": "^6.3.0",
     "ember-cli-blueprint-test-helpers": "^0.19.2",
     "ember-cli-browserstack": "^2.0.1",
     "ember-cli-dependency-checker": "^3.3.1",