fix: upgrade webpack-dev-server due to vulnerability

Author: streamich

package.json

@@ -63,7 +63,7 @@
     "react-test-renderer": "15.6.2",
     "rimraf": "2.6.2",
     "source-map-support": "0.5.6",
-    "webpack-dev-server": "2.11.2",
+    "webpack-dev-server": "3.1.11",
     "webpack": "3.12.0",
     "yarn": "1.7.0",
     "@storybook/react": "3.4.7",