README.md: Restore the explanation for matrix.archlinux.org

fe5a0787 · Jan Alexander Steffens (heftig) · b4e116b2 · fe5a0787
Verified Commit fe5a0787 authored Aug 24, 2020 by Jan Alexander Steffens (heftig)
--- a/README.md
+++ b/README.md
@@ -208,6 +208,12 @@ The following steps should be used to update our managed servers:
 #### Services
  - quassel core

+### matrix.archlinux.org
+
+#### Services
+  - Matrix homeserver (Synapse)
+  - Matrix ↔ IRC bridge
+
 ### homedir.archlinux.org

 #### Services