Tag v0.6.1

[elezar]

We should tag v0.6.1 including the changes to remove the runc dependency.

• pkg/cdi: remove github.com/opencontainers/runc/libcontainer dependency #158

[elezar]

@klihub @kad @bart0sh any objections to tagging v0.6.1?

[klihub]

I'm fine with tagging a new version.

[bart0sh]

no objections

[elezar]

Release is out https://github.com/cncf-tags/container-device-interface/releases/tag/v0.6.1