1.19.0

• #455: Ensure UUID of commands are stable in logging - @lazyatom
• #453: as and within now properly escape their user/group/path arguments, and the command nested within an as block is now properly escaped before passing to sh -c. In the unlikely case that you were manually escaping commands passed to SSHKit as a workaround, you will no longer need to do this. See #458 for examples of what has been fixed. - @grosser
• #460: Handle IPv6 addresses without port - @will-in-wi