chore(package): update ember-cli-htmlbars to version 4.0.3

Closes #83

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "ember-cli-code-coverage": "^0.4.0",
     "ember-cli-dependency-checker": "^2.0.0",
     "ember-cli-eslint": "^4.1.0",
-    "ember-cli-htmlbars": "^2.0.2",
+    "ember-cli-htmlbars": "^4.0.3",
     "ember-cli-htmlbars-inline-precompile": "^1.0.0",
     "ember-cli-inject-live-reload": "^1.4.1",
     "ember-cli-mirage": "^0.3.1",