Update style-loader from 0.20.3 to 0.21.0 in packages/react-scripts

Author: dependencies-bot

packages/react-scripts/package.json

@@ -50,7 +50,7 @@
     "react-dev-utils": "^4.1.0",
     "react-error-overlay": "^2.0.2",
     "source-map-loader": "0.2.3",
-    "style-loader": "0.20.3",
+    "style-loader": "0.21.0",
     "url-loader": "1.0.1",
     "webpack": "^3.7.1",
     "webpack-dev-server": "2.11.2",