Ssh2-python

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Changes
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* Added helper function ``ssh2.utils.find_eol`` for finding end of line characters in buffer.

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Changes
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* Updated embedded libssh2 version to ``1.9.0``.
* Rebuilt sources with Cython ``0.29.21``.
* Added support for Python 3.8 and 3.9.

Fixes
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* ``Session.userauth_publickey_frommemory`` would not work without an empty passphrase provided - 86

Packaging
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* Added Python 3.8 binary wheels for Linux, OSX and Windows.
* Added Python 3.9 binary wheels for Linux.
* Added OSX 10.14 and 10.15 wheels.
* Removed OSX < 10.14 wheels.
* Removed Python 2.7 OSX and Windows wheels.
* Removed Python 3.5 OSX and Windows wheels.
* Removed Windows 32-bit wheels.

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Changes
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* Session object de-allocation no longer calls session disconnect.
* Channel object de-allocation no longer calls channel close.
* Rebuilt sources with Cython ``0.29.6``.
* Updated Linux and Windows binary wheels to OpenSSL 1.1.
* Updated embedded ``libssh2`` to latest master.
* Added ``Ed25519`` publickey support via ``libssh2`` and OpenSSL upgrades.

Packaging
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* Source distribution builds would not include embedded libssh2 module in package - 51
* Removed OSX 10.10 binary wheel builds - deprecated by Travis-CI.
* Updated embedded OpenSSL version for Windows wheel builds.

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Packaging
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* Updated embedded OpenSSL version for Windows wheel builds.

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Packaging
----------

* Source distribution builds would not include embedded libssh2 module in package - 51
* Removed OSX 10.10 binary wheel builds - deprecated by Travis-CI.

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Changes
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* ``SFTPHandle.write`` function changed to return tuple of ``return_code, bytes_written`` for non-blocking applications to be able to handle partial writes within an SFTP write resulting from a blocked socket.
* ``Channel.write*`` functions changed to return tuple of ``return_code, bytes_written`` as above.

Behaviour in blocking mode has not changed. Non-blocking applications will now need to handle these functions returning a tuple and resume writes from last written offset of given data.