ssh2 version 0.9.4

libssh2-sys version 0.3.0

bump versions...

Pilot error on my part meant (my origin != upstream) that I published
the commit before my PR as the next version, so fix that up.

ci: ubuntu 16 is EOL and no longer available -> 20

bump versions...

Pilot error on my part meant (my origin != upstream) that I published
the commit before my PR as the next version, so fix that up.

ci: ubuntu 16 is EOL and no longer available -> 20

Prepare ssh2 0.9.1 and libssh2-sys 0.2.21 release

Prepare ssh2 0.9.1 and libssh2-sys 0.2.21 release

Update libssh2 submodule to track back from https://github.com/libssh…

…2/libssh2 (alexcrichton#205)

* Update libssh2 submodule to track back from https://github.com/libssh2/libssh2

* Update sys crate to track latest change from https://github.com/libssh2/libssh2

Update libssh2 submodule to track back from https://github.com/libssh…

…2/libssh2 (alexcrichton#205)

* Update libssh2 submodule to track back from https://github.com/libssh2/libssh2

* Update sys crate to track latest change from https://github.com/libssh2/libssh2