Update eslint-plugin-react (#3146)

* update eslint-plugin-react to 7.3.0

* Updated eslint-plugin-react to 7.4.0

Author: lpalmes

packages/react-scripts/package.json

@@ -38,7 +38,7 @@
     "eslint-plugin-flowtype": "2.35.0",
     "eslint-plugin-import": "2.7.0",
     "eslint-plugin-jsx-a11y": "5.1.1",
-    "eslint-plugin-react": "7.1.0",
+    "eslint-plugin-react": "7.4.0",
     "extract-text-webpack-plugin": "3.0.0",
     "file-loader": "0.11.2",
     "fs-extra": "3.0.1",