chore(package): update @ember/optional-features to version 1.2.0

Closes #42

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
   "devDependencies": {
     "@commitlint/cli": "^7.3.2",
     "@commitlint/config-conventional": "^7.3.1",
-    "@ember/optional-features": "^0.7.0",
+    "@ember/optional-features": "^1.2.0",
     "@semantic-release/changelog": "^3.0.2",
     "@semantic-release/git": "^7.0.8",
     "bower": "^1.8.4",