Bump @babel/preset-react from 7.7.4 to 7.9.4 (#117)

Bumps [@babel/preset-react](https://github.com/babel/babel) from 7.7.4 to 7.9.4.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.7.4...v7.9.4)

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package.json

@@ -39,7 +39,7 @@
     "@babel/plugin-proposal-nullish-coalescing-operator": "^7.7.4",
     "@babel/plugin-proposal-optional-chaining": "^7.9.0",
     "@babel/preset-env": "^7.7.7",
-    "@babel/preset-react": "^7.7.4",
+    "@babel/preset-react": "^7.9.4",
     "babel-eslint": "^10.1.0",
     "babel-loader": "^8.1.0",
     "babel-plugin-module-resolver": "^4.0.0",