chore(package): update ember-cli-htmlbars to version 4.0.4

Closes #59

Author: greenkeeper[bot]

package.json

@@ -47,7 +47,7 @@
     "ember-cli-code-coverage": "^1.0.0-beta.8",
     "ember-cli-dependency-checker": "^3.0.0",
     "ember-cli-eslint": "^5.0.0",
-    "ember-cli-htmlbars": "^3.0.0",
+    "ember-cli-htmlbars": "^4.0.4",
     "ember-cli-htmlbars-inline-precompile": "^2.1.0",
     "ember-cli-inject-live-reload": "^2.0.1",
     "ember-cli-qunit": "^4.3.2",