Update README.md

README.md

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 [![codecov](https://codecov.io/gh/binwiederhier/ntfy/branch/main/graph/badge.svg?token=A597KQ463G)](https://codecov.io/gh/binwiederhier/ntfy)
 [![Discord](https://img.shields.io/discord/874398661709295626?label=Discord)](https://discord.gg/cT7ECsZj9w)
 [![Matrix](https://img.shields.io/matrix/ntfy:matrix.org?label=Matrix)](https://matrix.to/#/#ntfy:matrix.org)
+[![Matrix space](https://img.shields.io/matrix/ntfy-space:matrix.org?label=Matrix+space)](https://matrix.to/#/#ntfy-space:matrix.org)
 [![Healthcheck](https://healthchecks.io/badge/68b65976-b3b0-4102-aec9-980921/kcoEgrLY.svg)](https://ntfy.statuspage.io/)
 
 **ntfy** (pronounce: *notify*) is a simple HTTP-based [pub-sub](https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern) notification service.