Show jid of people who changed some setting in group. (#688)

* JId of people who changed settings in group.

* Show jid of people who changed some setting in group.

* fix lint

src/Types/GroupMetadata.ts

@@ -36,7 +36,7 @@ export interface GroupMetadata {
     participants: GroupParticipant[]
     ephemeralDuration?: number
     inviteCode?: string
-    /** the person who added you */
+    /** the person who added you to group or changed some setting in group */
     author?: string
 }
 

src/Utils/process-message.ts

@@ -298,7 +298,7 @@ const processMessage = async(
 			ev.emit('group-participants.update', { id: jid, author: message.participant!, participants, action })
 		)
 		const emitGroupUpdate = (update: Partial<GroupMetadata>) => {
-			ev.emit('groups.update', [{ id: jid, ...update }])
+			ev.emit('groups.update', [{ id: jid, ...update, author: message.participant ?? undefined }])
 		}
 
 		const participantsIncludesMe = () => participants.find(jid => areJidsSameUser(meId, jid))