add missing function. Fixes #5585

src/common/account.py

@@ -25,6 +25,9 @@ class Account(object):
 		self.contacts = contacts
 		self.gc_contacts = gc_contacts
 
+	def change_contact_jid(self, old_jid, new_jid):
+		self.contacts.change_contact_jid(old_jid, new_jid)
+
 	def __repr__(self):
 		return self.name