threadscope.cabal: allow unix-2.7 (ghc-7.8)

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
threadscope.cabal: updated upstream URL

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Merge pull request #1 from trofi/master

threadscope.cabal: allow unix-2.7 (ghc-7.8)