Bump core-js from 2.6.3 to 3.6.4

Bumps [core-js](https://github.com/zloirock/core-js) from 2.6.3 to 3.6.4.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](zloirock/core-js@v2.6.3...v3.6.4)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package-lock.json

@@ -182,7 +182,7 @@
     "axios": "0.19.0",
     "command-exists": "1.2.8",
     "commander": "4.1.1",
-    "core-js": "^2.6.3",
+    "core-js": "^3.6.4",
     "electron-dl": "2.0.0",
     "eslint": "5.16.0",
     "follow-redirects": "1.9.0",