v1.3.0

Bugfixes:

• Improve error handling for image uploads to prevent accepting unsupported formats
• Fix event deletion to work correctly (thanks @redneckcatholic)
• Better handling for event attendee limits
• Prevent MongoDB issues with event deletion passwords

Features:

• Update ActivityPub code to support recent Mastodon (thanks @dariusk)
• Allow attendees to specify number of people in their party