Features:

• Support for updating and deleting notifications (#303, #1536, ntfy-android#151, thanks to @wunter8 for the initial implementation)
• Support for heartbeat-style / dead man's switch notifications aka updating and deleting scheduled notifications (#1556, #1142, #954, thanks to @GamerGirlandCo for the initial implementation)
• Configure custom Twilio call format for phone calls (#1289, thanks to @mmichaa for the initial implementation)
• ntfy serve now works on Windows, including support for running it as a Windows service (#1104, #1552, originally #1328, thanks to @wtf911)
• Web app: "New version available" banner (#1554)