Version 4.7
* The :meth:.pxssh.login method now no longer requires a username if an ssh
config is provided and will raise an error if neither are provided.
* The :meth:.pxssh.login method now supports providing your own ssh
command via the cmd parameter.
* :class:.pxssh now supports the use_poll parameter which is passed into :meth:.pexpect.spawn
* Minor bug fix with ssh_config.
* :meth:.replwrap.run_command now has async support via an async_ parameter.
* :meth:.pexpect.spawn will now read additional bytes if able up to a buffer limit.
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