Add missing sass bundled dependencies

Author: lexun

packages/react-scripts/package.json

@@ -109,13 +109,15 @@
     "http-proxy-middleware",
     "jest",
     "json-loader",
+    "node-sass",
     "object-assign",
     "path-exists",
     "postcss-loader",
     "promise",
     "react-dev-utils",
     "recursive-readdir",
     "rimraf",
+    "sass-loader",
     "strip-ansi",
     "style-loader",
     "url-loader",