Remove undelivireable messages

Dependencies

• [2] 55VVNPHU Log presence errors as errors
• [*] TGO4TIWU Fix README

Change contents

• edit in src/xmpp/xmpp_connection.rs at line 683
  [2.214]

  [2.214]
  + if let Some(from) = presence.from {

  + if let Some(ref mut mailbox) = self

  + .state

  + .data

  + .outgoing_mailbox

  + .remove(&from.clone().into())

  + {

  + if !mailbox.is_empty() {

  + warn!(

  + "Removed {} undeliverable messages for {}",

  + mailbox.len(),

  + from

  + );

  + }

  + }

  + }