fix(package): update style-loader to version 0.23.1 (plotly#323)

Author: greenkeeper[bot]

packages/dash-core-components/package.json

@@ -55,7 +55,7 @@
     "react-select-fast-filter-options": "^0.2.2",
     "react-syntax-highlighter": "^5.0.0",
     "react-virtualized-select": "^3.1.0",
-    "style-loader": "^0.21.0",
+    "style-loader": "^0.23.1",
     "styled-jsx": "^3.1.0",
     "webpack": "^4.8.3",
     "webpack-cli": "^2.1.3",