Update dependency eslint-plugin-react to v7.21.5

Author: renovate-bot

package.json

@@ -25,7 +25,7 @@
     "babel-eslint": "10.0.2",
     "babel-preset-react-native": "4.0.1",
     "eslint": "6.0.1",
-    "eslint-plugin-react": "7.14.2",
+    "eslint-plugin-react": "7.21.5",
     "metro-react-native-babel-preset": "0.55.0",
     "react": "16.8.6",
     "react-native": "0.60.3"