- update to 0.4.0:
    + Change the daemon mod flag for all tunnel threads (is not fully backward
      compatible) to prevent unexpected hangs (`#219`_) + Add docker based end to end
      functinal tests for Mongo/Postgres/MySQL
    + Add docker based end to end hangs tests
    + Fix host key directory detection
    + Unify default ssh config folder to `~/.ssh`
    + Increase open connection timeout to 10 secods
    + Change default with context behavior to use `.stop(force=True)` on exit
    + Remove useless `daemon_forward_servers = True` hack for hangs prevention
    + Set transport keepalive to 5 second by default
    + Set default transport timeout to 0.1
    + Deprecate and remove `block_on_close` option
    + Fix "deadlocks" / "tunneling hangs"
    + Add `.stop(force=True)` for force close active connections
    + Fixes bug with orphan thread for a tunnel that is DOWN 
    + Support IPv6 without proxy command. Use built-in paramiko create socket
      logic. The logic tries to use ipv6 socket family first, then ipv4 socket
      family.

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