Add `is_accepted` property to talks
Add `is_accepted` property to talks

This property will be useful for taking actions when a talk has been
accepted.

PyGotham/pygotham,PyGotham/pygotham,djds23/pygotham-1,djds23/pygotham-1,pathunstrom/pygotham,djds23/pygotham-1,djds23/pygotham-1,PyGotham/pygotham,PyGotham/pygotham,djds23/pygotham-1,pathunstrom/pygotham,PyGotham/pygotham,pathunstrom/pygotham,pathunstrom/pygotham,pathunstrom/pygotham