Bump @babel/core from 7.6.2 to 7.7.7 (#65)

Bumps [@babel/core](https://github.com/babel/babel) from 7.6.2 to 7.7.7.
- [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/v7.6.2...v7.7.7)

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

package.json

@@ -33,7 +33,7 @@
     "url-pattern": "^1.0.3"
   },
   "devDependencies": {
-    "@babel/core": "^7.2.2",
+    "@babel/core": "^7.7.7",
     "@babel/plugin-proposal-class-properties": "^7.7.4",
     "@babel/plugin-proposal-decorators": "^7.7.4",
     "@babel/plugin-proposal-nullish-coalescing-operator": "^7.7.4",