Features:

• Support for updating and deleting notifications (#303, #1536, ntfy-android#151, thanks to @wunter8 for the initial implementation)
• Support for self-signed certs and client certs for mTLS (#215, #530, ntfy-android#149, thanks to @cyb3rko for reviewing)
• Connection error dialog to help diagnose connection issues

Bug fixes + maintenance:

• Use server-specific user for attachment downloads (#1529, thanks to @ManInDark for reporting and testing)