Bump @babel/core from 7.5.5 to 7.7.7

Bumps [@babel/core](https://github.com/babel/babel) from 7.5.5 to 7.7.7.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](babel/babel@v7.5.5...v7.7.7)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -48,7 +48,7 @@
   "types": "./src/index.d.ts",
   "devDependencies": {
     "@babel/cli": "^7.5.5",
-    "@babel/core": "^7.5.5",
+    "@babel/core": "^7.7.7",
     "@babel/node": "^7.5.5",
     "@babel/plugin-proposal-class-properties": "^7.5.5",
     "@babel/plugin-transform-react-jsx": "^7.3.0",