v0.6.4

Added support for group replies - @hkousha
Added support for user & source team in app - mention events - @sfzylad
Added support for shortcut interaction type - @cynicaljoy
Added support for replacing and deleting original message with ResponseURL - @frozenbonito
Added support for multi-select input blocks - @jojo43
Added missing omitempty for client_msg_id - @DanielleB-R
Added support for checkboxes - @eliot-stripe
Added support for multi-users in users.info - @isdzulqor
Removed unused dependency - @mjwhitta
Removed incorrect TeamID from OAuth 2 response - @mzduke

Thank you for all the contributions!