Bump @babel/plugin-proposal-class-properties from 7.5.5 to 7.10.4 (#230)

Bumps [@babel/plugin-proposal-class-properties](https://github.com/babel/babel/tree/HEAD/packages/babel-plugin-proposal-class-properties) from 7.5.5 to 7.10.4.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.10.4/packages/babel-plugin-proposal-class-properties)

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package.json

@@ -50,7 +50,7 @@
     "@babel/cli": "^7.5.5",
     "@babel/core": "^7.5.5",
     "@babel/node": "^7.5.5",
-    "@babel/plugin-proposal-class-properties": "^7.5.5",
+    "@babel/plugin-proposal-class-properties": "^7.10.4",
     "@babel/plugin-transform-react-jsx": "^7.3.0",
     "@babel/plugin-transform-typescript": "^7.5.5",
     "@babel/preset-env": "^7.5.5",