[sheepdog] [ANNOUNCE, CAUTION] sheepdog stable release v0.8.1

[Hitoshi Mitake]

Hi sheepdog users and developers,

I released v0.8.1 of stable branch. You can download a source archive
from these URLs:
tar.gz: https://github.com/sheepdog/sheepdog/archive/v0.8.1.tar.gz
zip: https://github.com/sheepdog/sheepdog/archive/v0.8.1.zip

The content of v0.8.1 is same to v0.8.1_rc1.

I have to emphasis on the point that updating from v0.8.0 to
v0.8.1 requires "-u" option, because it contains updating store
format. Sorry for inconvenience but the format update is a necessary
change for clusters which store many objects.

Thanks,
Hitoshi