[sheepdog-users] update homepage

[Valerio Pachera]

   - The latest 0.8.x release is 0.8.2
   <https://github.com/sheepdog/sheepdog/tarball/v0.8.2>
   - The latest 0.7.x release is 0.7.8
   <https://github.com/sheepdog/sheepdog/tarball/v0.7.8>

0.8.3 has already been released.
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