New features:
* MacroDroid/Tasker: send/receive ntfy messages via other apps (#31)

Bug fixes:
* Manually refreshing fails if one subscription URL is not reachable (#27)
* Opening ntfy.sh/docs on a phone opens the app man_facepalming (#34)
* Restart foreground service on upgrade and if otherwise killed (#56)
* Fix tag_map in intent broadcast (no ticket)