allow events descriptions to contain 0 values

[compmonks]

I have an event file with 'labels' (description) which contain 0 values.
In this case, the labels are rotations in degrees but write_brainvision fails during _chk_events and returns the following error: events: when type is Stimulus, descriptions must be positve ints.

Would it be possible to allow event["description"] to be at least >= 0 instead of >=1? The current test is

443 if event["description"] < 1:
444                 raise ValueError(f"events: when `type` is {event['type']}, "
445                                  "descriptions must be positve ints.")```

[sappelhoff]

Thanks for the report I think >= 0 would still be fine. Do you want to prepare a PR?

Alternatively, just use the stimulus type Comment and you can add whatever information you'd like.

[compmonks]

@sappelhoff , thanks! I just created one there: #95 .
@cbrnr, I did not change anything regarding the event duration test :)

[sappelhoff]

closed in #95