fix: added invite property (#218)

If the user does not allow to be added directly, it will be possible to get the invite code and create an invitation message for the user to join the group

src/Socket/groups.ts

@@ -193,7 +193,7 @@ export const makeGroupsSocket = (config: SocketConfig) => {
 			const node = getBinaryNodeChild(result, action)
 			const participantsAffected = getBinaryNodeChildren(node!, 'participant')
 			return participantsAffected.map(p => {
-				return { status: p.attrs.error || '200', jid: p.attrs.jid }
+				return { status: p.attrs.error || '200', jid: p.attrs.jid, content: p }
 			})
 		},
 		groupUpdateDescription: async(jid: string, description?: string) => {