Log Message:
Update ruby-sshkit to 1.11.3.

## [1.11.3][] (2016-09-16)

  * Fix known_hosts caching to match on the entire hostlist
    [PR #364](https://github.com/capistrano/sshkit/pull/364) @byroot

## [1.11.2][] (2016-07-29)

### Bug fixes

  * Fixed a crash occurring when `Host@keys` was set to a non-Enumerable.
    @xavierholt [PR #360](https://github.com/capistrano/sshkit/pull/360)

## [1.11.1][] (2016-06-17)

### Bug fixes

  * Fixed a regression in 1.11.0 that would cause
    `ArgumentError: invalid option(s): known_hosts` in some older versions of
    net-ssh. @byroot [#357](https://github.com/capistrano/sshkit/issues/357)

## [1.11.0][] (2016-06-14)

### Bug fixes

  * Fixed colorized output alignment in Logger::Pretty. @xavierholt
    [PR #349](https://github.com/capistrano/sshkit/pull/349)
  * Fixed a bug that prevented nested `with` calls
    [#43](https://github.com/capistrano/sshkit/issues/43)

### Other changes

  * Known hosts lookup optimization is now enabled by default. @byroot

## 1.10.0 (2016-04-22)

  * 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](https://github.com/capistrano/sshkit/tree/v1.10.0#known-hosts-caching) \ 
for
    details. We plan to turn this on by default in a future version of SSHKit.
    [PR #330](https://github.com/capistrano/sshkit/pull/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](https://github.com/capistrano/sshkit/pull/343) @mattbrictson
  * Allow command map entries (`SSHKit::CommandMap#[]`) to be Procs
    [PR #310](https://github.com/capistrano/sshkit/pull/310)
    @mikz

## 1.9.0

**Refer to the 1.9.0.rc1 release notes for a full list of new features, fixes,
and potentially breaking changes since SSHKit 1.8.1.** There are no changes
since 1.9.0.rc1.

## 1.9.0.rc1

### Potentially breaking changes

  * The SSHKit DSL is no longer automatically included when you `require` it.
    **This means you  must now explicitly `include SSHKit::DSL`.**
    See [PR #219](https://github.com/capistrano/sshkit/pull/219) for details.
    @beatrichartz
  * `SSHKit::Backend::Printer#test` now always returns true
    [PR #312](https://github.com/capistrano/sshkit/pull/312) @mikz

### New features

  * `SSHKit::Formatter::Abstract` now accepts an optional Hash of options
    [PR #308](https://github.com/capistrano/sshkit/pull/308) @mattbrictson
  * Add `SSHKit::Backend.current` so that Capistrano plugin authors can refactor
    helper methods and still have easy access to the currently-executing Backend
    without having to use global variables.
  * Add `SSHKit.config.default_runner` options that allows to override default \ 
command runner.
    This option also accepts a name of the custom runner class.
  * The ConnectionPool has been rewritten in this release to be more efficient
    and have a cleaner internal API. You can still completely disable the pool
    by setting `SSHKit::Backend::Netssh.pool.idle_timeout = 0`.
    @mattbrictson @byroot [PR #328](https://github.com/capistrano/sshkit/pull/328)

### Bug fixes

  * make sure working directory for commands is properly cleared after `within` \ 
blocks
    [PR #307](https://github.com/capistrano/sshkit/pull/307)
    @steved
  * display more accurate string for commands with spaces being output in \ 
`Formatter::Pretty`
    [PR #304](https://github.com/capistrano/sshkit/pull/304)
    @steved
    [PR #319](https://github.com/capistrano/sshkit/pull/319) @mattbrictson
  * Fix a race condition experienced in JRuby that could cause multi-server
    deploys to fail. [PR #322](https://github.com/capistrano/sshkit/pull/322)
    @mattbrictson