chore(deps): update dependency html-webpack-plugin to v4.2.1

Author: renovate-bot

package-lock.json

@@ -55,7 +55,7 @@
     "eslint-plugin-promise": "4.2.1",
     "eslint-plugin-react": "7.19.0",
     "eslint-plugin-standard": "4.0.1",
-    "html-webpack-plugin": "4.2.0",
+    "html-webpack-plugin": "4.2.1",
     "husky": "4.2.5",
     "jest": "25.3.0",
     "jsdom": "16.2.2",