chore(package): update ember-cli-sass to version 7.2.0

Closes #13

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "ember-cli-moment-shim": "3.5.0",
     "ember-cli-qunit": "^4.3.0",
     "ember-cli-release": "^0.2.9",
-    "ember-cli-sass": "7.1.4",
+    "ember-cli-sass": "7.2.0",
     "ember-cli-shims": "^1.0.2",
     "ember-cli-sri": "^2.1.0",
     "ember-cli-test-loader": "^2.2.0",