Sync config.json with JS track
Sync config.json with JS track

MattH-be/ecmascript,arthurchipdean/xecmascript,tejasbubane/xecmascript,exercism/xecmascript,arthurchipdean/xecmascript,tejasbubane/xecmascript,exercism/xecmascript,MattH-be/ecmascript