Feature Request: add --notentative flag

[tj-smith47]

First, thanks for the awesome tool!

I've wrapped this tool in an automatic cron script to auto-open meetings. It would be nice to be able to filter out both declined meetings as well as ones where a user has responded maybe - or even only grab those entries and respond in a different way. Alternatively, add either a status option for --details, or provide information when the attendees option is passed.

[dbarnett]

Filtering on RSVP state seems useful. For a flag mechanism I'd propose something more like --rsvp=YES / --rsvp=YES,MAYBE though, since trying to guess what a --nomaybe or --notentative flag does hurts my brain. 😅