[Feature] Make having groups on your timeline optional

[seanlowe]

I see nothing in the docs about groups being required for this to work but it seems like that might be the case. Trying to integrate this package into an Obsidian plugin that uses vis-timeline

Edit: Looks like that is the case. I was able to get it to work by arbitrarily adding all my items to a single group and passing that through to the timeline.

Changing this issue from a question to a feature request so that groups can be optional.