- update to 2.1.0
 * Added support in the SSHProcess redirect mechanism to accept asyncio StreamReader and StreamWriter objects, allowing asyncio streams to be plugged in as stdin/stdout/stderr in an SSHProcess.
 * Added support for key handlers in the AsyncSSH line editor to trigger signals being delivered when certain “hot keys” are hit while reading input.
 * Improved cleanup of unreturned connection objects when an error occurs or the connection request is canceled or times out.
 * Improved cleanup of SSH agent client objects to avoid triggering a false positive warning in Python 3.8.
 * Added an example to the documentation for how to create reverse-direction SSH client and server connections.
 * Made check of session objects against None explicit to avoid confusion on user-defined sessions that implement __len__ or __bool__. Thanks go to Lars-Dominik Braun for contributing this improvement!
 * Some API changes which should have been included in the 2.0.0 release were missed. This release corrects that, but means that additional changes may be needed in applications moving to 2.0.1. This should hopefully be the last of such changes, but if any other issues are discovered, additional changes will be limited to 2.0.x patch releases and the API will stabilize again in the AsyncSSH 2.1 release. See the next bullet for details about the additional incompatible change.
 * To be consistent with other connect and listen functions, all methods on SSHClientConnection which previously returned None on listen failures have been changed to raise an exception instead. A new ChannelListenError exception will now be raised when an SSH server returns failure on a request to open a remote listener. This change affects the following SSHClientConnection methods: create_server, create_unix_server, start_server, start_unix_server, forward_remote_port, and forward_remote_path.
 * Restored the ability for SSHListener objects to be used as async context managers. This previously worked in AsyncSSH 1.x and was unintentionally broken in AsyncSSH 2.0.0.
 * Added support for a number of additional functions to be called from within an “async with” statement. These functions already returned objects capable of being async context managers, but were not decorated to allow them to be directly called from within “async with”. This change applies to the top level functions create_server, listen, and listen_reverse and the SSHClientConnection methods create_server, create_unix_server, start_server, start_unix_server, forward_local_port, forward_local_path, forward_remote_port, forward_remote_path, listen_ssh, and listen_reverse_ssh,
 * Fixed a couple of issues in loading OpenSSH-format certificates which were missing a trailing newline.
 * Changed load_certificates() to allow multiple certificates to be loaded from a single byte string argument, making it more consistent with how load_certificates() works when reading from a file.
 * Updated AsyncSSH to use the modern async/await syntax internally, now requiring Python 3.6 or later. Those wishing to use AsyncSSH on Python 3.4 or 3.5 should stick to the AsyncSSH 1.x releases.
 * Changed first argument of SFTPServer constructor from an SSHServerConnection (conn) to an SSHServerChannel (chan) to allow custom SFTP server implementations to access environment variables set on the channel that SFTP is run over. Applications which subclass the SFTPServer class and implement an __init__ method will need to be updated to account for this change and pass the new argument through to the SFTPServer parent class. If the subclass has no __init__ and just uses the connection, channel, and env properties of SFTPServer to access this information, no changes should be required.
 * Removed deprecated “session_encoding” and “session_errors” arguments from create_server() and listen() functions. These arguments were renamed to “encoding” and “errors” back in version 1.16.0 to be consistent with other AsyncSSH APIs.
 * Removed get_environment(), get_command(), and get_subsystem() methods on SSHServerProcess class. This information was made available as “env”, “command”, and “subsystem” properties of SSHServerProcess in AsyncSSH 1.11.0.
 * Removed optional loop argument from all public AsyncSSH APIs, consistent with the deprecation of this argument in the asyncio package in Python 3.8. Calls will now always use the event loop which is active at the time of the call.
 * Removed support for non-async context managers on AsyncSSH connections and processes and SFTP client connections and file objects. Callers should use “async with” to invoke the async the context managers on these objects.
 * Added support for SSHAgentClient being an async context manager. To be consistent with other connect calls, connect_agent() will now raise an exception when no agent is found or a connection failure occurs, rather than logging a warning and returning None. Callers should catch OSError or ChannelOpenError exceptions rather than looking for a return value of None when calling this function.
 * Added set_input() and clear_input() methods on SSHLineEditorChannel to change the value of the current input line when line editing is enabled.
 * Added is_closing() method to the SSHChannel, SSHProcess, SSHWriter, and SSHSubprocessTransport classes. mirroring the asyncio BaseTransport and StreamWriter methods added in Python 3.7.
 * Added wait_closed() async method to the SSHWriter class, mirroring the asyncio StreamWriter method added in Python 3.7.

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