Bump @babel/plugin-proposal-class-properties from 7.7.4 to 7.8.3 (#73)

Bumps [@babel/plugin-proposal-class-properties](https://github.com/babel/babel) from 7.7.4 to 7.8.3.
- [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...v7.8.3)

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package.json

@@ -34,7 +34,7 @@
   },
   "devDependencies": {
     "@babel/core": "^7.7.7",
-    "@babel/plugin-proposal-class-properties": "^7.7.4",
+    "@babel/plugin-proposal-class-properties": "^7.8.3",
     "@babel/plugin-proposal-decorators": "^7.7.4",
     "@babel/plugin-proposal-nullish-coalescing-operator": "^7.7.4",
     "@babel/plugin-proposal-optional-chaining": "^7.7.5",