update to ember-cli 3.4.3

Author: snewcomer

package.json

@@ -22,7 +22,7 @@
   "devDependencies": {
     "broccoli-asset-rev": "^2.7.0",
     "chai": "^4.1.2",
-    "ember-cli": "^3.3.0",
+    "ember-cli": "~3.4.3",
     "ember-cli-app-version": "^3.1.3",
     "ember-cli-dependency-checker": "^2.1.0",
     "ember-cli-eslint": "^4.2.3",