Update dependency eslint-plugin-react to v7.20.4

Author: renovate-bot

package.json

@@ -122,7 +122,7 @@
     "eslint-loader": "1.9.0",
     "eslint-plugin-import": "2.22.0",
     "eslint-plugin-jsx-a11y": "6.2.3",
-    "eslint-plugin-react": "7.14.3",
+    "eslint-plugin-react": "7.20.4",
     "extract-text-webpack-plugin": "4.0.0-beta.0",
     "faker": "4.1.0",
     "file-loader": "3.0.1",