Update dependency eslint-plugin-react to v7

Author: renovate-bot

package.json

@@ -46,7 +46,7 @@
     "eslint-config-airbnb": "18.2.0",
     "eslint-plugin-import": "2.22.1",
     "eslint-plugin-jsx-a11y": "4.0.0",
-    "eslint-plugin-react": "6.10.3",
+    "eslint-plugin-react": "7.21.3",
     "flow-bin": "0.135.0",
     "mocha": "3.5.3",
     "nyc": "10.3.2",