Update dependency eslint-plugin-react to v7.12.4

Author: renovate-bot

package-lock.json

@@ -51,7 +51,7 @@
     "eslint-config-airbnb": "17.1.0",
     "eslint-plugin-import": "2.14.0",
     "eslint-plugin-jsx-a11y": "6.1.2",
-    "eslint-plugin-react": "7.12.3",
+    "eslint-plugin-react": "7.12.4",
     "file-loader": "3.0.1",
     "gh-pages": "2.0.1",
     "html-webpack-plugin": "3.2.0",