[sheepdog] [ANNOUNCE] sheepdog stable release v0.6.1

[Hitoshi Mitake]

(Resending announce because of a slight fix of the tag)

Hi sheepdog users and developers,

I released v0.6.1 of stable branch. You can download a source archive
from this URL:
https://github.com/sheepdog/sheepdog/releases/tag/v0.6.1

You can also use a newly created tag v0.6.1 for obtaining the source
tree.

This release contains bug fixes for major known problems and
improvements for packaging. Especially the stability of object cache
is improved compared to v0.6.0. If your sheepdog deployment is turning
on object cache, updating will be helpful.

Thanks,
Hitoshi