chore: update dependency eslint-plugin-react to v7.20.0

Author: renovate-bot

package.json

@@ -66,7 +66,7 @@
     "eslint": "6.5.1",
     "eslint-config-prettier": "6.4.0",
     "eslint-plugin-prettier": "3.1.1",
-    "eslint-plugin-react": "7.16.0",
+    "eslint-plugin-react": "7.20.0",
     "fork-ts-checker-webpack-plugin": "1.5.1",
     "gh-pages": "2.1.1",
     "jest": "24.9.0",