fix: upgrade eslint-plugin-react from 7.1.0 to 7.18.0

Snyk has created this PR to upgrade eslint-plugin-react from 7.1.0 to 7.18.0.

See this package in NPM:
https://www.npmjs.com/package/eslint-plugin-react

See this project in Snyk:
https://app.snyk.io/org/davidkindler/project/6865432e-9ae7-40aa-ab6d-807d59d4dccc?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -23,7 +23,7 @@
     "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": "7.18.0",
     "extract-text-webpack-plugin": "3.0.0",
     "file-loader": "0.11.2",
     "fs-extra": "3.0.1",