Added lock threads workflow (#215)

* Added lock threads workflow
* Updated appveyor cfg

Updated appveyor cfg (#216)

Manylinux fix (#212)

* Fix docker tag for manylinux
* Updated changelog

Manylinux (#211)

* Updated changelog
* Updated manylinux wheel building
* Updated CI cfg

Appveyor (#210)

* Fix broken openssl library names on appveyor builds

Arm wheel (#209)

* Updated arm manylinux file
* Updated appveyor cfg

Upgrades (#208)

Updated CI cfg (#180)

Updated CI cfg (#180)

Libssh2 upg (#179)

* Upgraded libssh2 to 1.10.0.
* Regenerated with latest cython.
* Updated docker files for new libssh2 and openssl versions. Removed obsolete file.
* Updated readthedocs config.
* Updated setup.py, CI cfgs, CI scripts.
* Updated Changelog.