add sass-loader

Author: Plortinus

template/package.json

@@ -36,7 +36,7 @@
     {{/less}}
     {{#sass}}
     "node-sass": "^4.5.3",
-    "postcss-loader": "^1.3.3",
+    "sass-loader": "^6.0.6",
     {{/sass}}
     "postcss-loader": "^1.3.3",
     "style-loader": "^0.16.1",