Bump @babel/plugin-proposal-class-properties from 7.12.1 to 7.12.13 (#56)

Bumps [@babel/plugin-proposal-class-properties](https://github.com/babel/babel/tree/HEAD/packages/babel-plugin-proposal-class-properties) from 7.12.1 to 7.12.13.
- [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/v7.12.13/packages/babel-plugin-proposal-class-properties)

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package-lock.json

@@ -35,7 +35,7 @@
         "dist"
     ],
     "devDependencies": {
-        "@babel/plugin-proposal-class-properties": "^7.12.1",
+        "@babel/plugin-proposal-class-properties": "^7.12.13",
         "@babel/preset-env": "^7.12.13",
         "@babel/preset-react": "^7.12.13",
         "@babel/preset-typescript": "^7.12.13",