fix: all praise the allmighty yamllinter

roles/matrix-bridge-heisenbridge/defaults/main.yml

@@ -1,3 +1,4 @@
+---
 # heisenbridge is a bouncer-style Matrix IRC bridge
 # See: https://github.com/hifi/heisenbridge
 
@@ -34,13 +35,13 @@ matrix_heisenbridge_registration_yaml:
   id: heisenbridge
   url: http://matrix-heisenbridge:9898
   as_token: "{{ matrix_heisenbridge_appservice_token }}"
-  hs_token: "{{ matrix_heisenbridge_homeserver_token }}" 
+  hs_token: "{{ matrix_heisenbridge_homeserver_token }}"
   rate_limited: false
   sender_localpart: heisenbridge
   namespaces:
     users:
-    - regex: '@hbirc_.*'
-      exclusive: true
+      - regex: '@hbirc_.*'
+        exclusive: true
     aliases: []
     rooms: []