Bump @babel/core from 7.4.4 to 7.6.4

Bumps [@babel/core](https://github.com/babel/babel) from 7.4.4 to 7.6.4.
- [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/v7.4.4...v7.6.4)

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

package.json

@@ -42,7 +42,7 @@
     "rbush": "^3.0.1"
   },
   "devDependencies": {
-    "@babel/core": "^7.4.0",
+    "@babel/core": "^7.6.4",
     "@babel/preset-env": "^7.4.4",
     "@openlayers/eslint-plugin": "^4.0.0",
     "@types/arcgis-rest-api": "^10.4.4",