Update version numbers in README for the next bugfix release

Windows virtual environment: Use SSH binaries from the Git suite (web…

…factory#63)

* Use SSH binaries from the Git suite

* Try to kill the ssh-agent upon action termination on Windows as well

Prepare README for the upcoming 0.5.0 release

Update README for a 0.4.1 release

Ignore failures when trying to kill the `ssh-agent` (webfactory#33)

Randomize SSH auth socket, kill agent to support non-ephemeral, self …

…hosted runners (@thommyhh, webfactory#27)

Thanks to @thommyhh for this contribution!

Unless the `SSH_AUTH_SOCK` is configured explicitly, this change will make the SSH agent use a random file name for the socket. That way, multiple, concurrent SSH agents can be used on non-ephemeral, self-hosted runners.

A new post-action step will automatically clean up the running agent at the end of a job.

Be aware of the possible security implications: Two jobs running on the same runner might be able to access each other's socket and thus access repositories and/or hosts.

Prepare the v0.2.0 release

Use `$HOME` to support OS X as well (webfactory#2)

This fixes webfactory#1. Windows is currently not supported.

Replace invalid icon