feat(deps): add required dependencies for sass files (#351)

Author: MartoYankov

dependencyManager.js

@@ -64,6 +64,8 @@ function getRequiredDeps(packageJson) {
         "copy-webpack-plugin": "~4.0.1",
         "raw-loader": "~0.5.1",
         "css-loader": "~0.28.7",
+        "sass-loader": "~6.0.6",
+        "node-sass": "~4.7.2",
         "nativescript-worker-loader": "~0.8.1",
         "resolve-url-loader": "~2.1.0",
         "extract-text-webpack-plugin": "~3.0.0",