Stop using clap's 'derive' feature for a single argument

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

src/xmpp.rs

@@ -64,6 +64,9 @@ impl XmppClient {
 								.await
 						}
 					}
+					Event::Disconnected => {
+						debug!("XMPP Disconnected");
+					}
 					_ => {
 						debug!("XMPP Event not supported")
 					}