1.10.0

• You can now opt-in to caching of SSH's known_hosts file for a speed boost
  when deploying to a large fleet of servers. Refer to the
  README for
  details. We plan to turn this on by default in a future version of SSHKit.
  PR #330 @byroot
• SSHKit now explicitly closes its pooled SSH connections when Ruby exits;
  this fixes zlib(finalizer): the stream was freed prematurely warnings
  PR #343 @mattbrictson
• Allow command map entries (SSHKit::CommandMap#[]) to be Procs
  PR #310
  @mikz