Security update for git-annex (moderate)

This update for git-annex to version 6.20180626 fixes the following issues:

• CVE-2018-10857: Prevent file content disclosure by refusing to download
  content that cannot be verified with a hash, from encrypted special
  remotes and glacier (bsc#1098062).
• CVE-2018-10859: Prevent local gpg encrypted file disclosure by refusing
  to download content that cannot be verified with a hash, from encrypted
  special remotes (bsc#1098364).

This update brings many other bug fixes and new features.
<a href=“http://hackage.haskell.org/package/git-annex-6.20180626/changelog”>http://hackage.haskell.org/package/git-annex-6.20180626/changelog</a> has a
detailed list of changes.