bug报告

[502milk]

复现步骤:在tg内输入任意/开头的字符串会报错，导致tg单方面无法向qq发送消息，而qq的消息却能发回tg
报错内容:thread 'tokio-runtime-worker' panicked at 'called Result::unwrap()on anErrvalue: UnknownCommand("/123")', src\despatch.rs:85:82 note: run withRUST_BACKTRACE=1` environment variable to display a backtrace
ERROR teloxide::dispatching::dispatcher > The RX part of the UpdateKind::Message channel is closed, but an update is received.
Error:channel closed

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