shim v0.6.0

What's Changed

Shim crate

• Remove the use of the regex crate by @bryantbiggs in #201
• [Windows] Retry when pipe is busy by @jsturtevant in #206
• Use log format similar to containerd by @jsturtevant in #210
• Add support for structured logging by @jsturtevant in #212
• Updates cgroup rs to latest version by @jsturtevant in #215
• Update nix crate to 0.27 by @mxpv in #211