Revert "AppVeyor IRC notifications: remove unnecessary delay"

This reverts commit 3d2bbf94b1da95e5eed23dbe8a306c554d275a8a.

The notifications don't show up without the delay, the connection is
closed too early. Thus, I'll just restore the delay.

utils/appveyor/irc-notify.py

@@ -162,6 +162,7 @@ if __name__ == '__main__':
                 for msg in messages:
                     print('PRIVMSG #{} :{}'.format(channel, msg))
                     irc_sock.send('PRIVMSG #{} :{}\r\n'.format(channel, msg).encode())
+                time.sleep(5)
                 # leave the channel
                 irc_sock.send('PART #{}\r\n'.format(channel).encode())
                 sys.exit()