add muc_reserve_nick_pattern

defaults/muc.yml

@@ -56,3 +56,9 @@ prosody_muc_modules:
   - name: 'muc_offline_delivery'
     description: 'implements support for sending messages in a MUC to affiliated users who are not in the room.'
     module_enabled: 'true'
+
+  - name: 'muc_reserve_nick_pattern'
+    description: 'checks the nickname of a joining user against a configurable list of Lua patterns.'
+    module_enabled: 'true'
+    extra_options: 
+      - 'muc_reserve_nick_patterns = { root, admin }'