出现问题
今天电脑push到github的时候，push失败
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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
SHA256:xxx.
Please contact your system administrator.
Add correct host key in xxx/.ssh/known_hosts to get rid of this message.
Offending RSA key in xxx/.ssh/known_hosts:3
Host key for github.com has changed and you have requested strict checking.
Host key verification failed.
致命错误：无法读取远程仓库。
解决
打开known_hosts，将github.com那行的秘钥删除，然后重新push，重新生成即可
