.cabal: bump cabal-version to >= 1.10
.cabal: bump cabal-version to >= 1.10

Hackage currently requires minimum cabal-version of v1.10.  Bump the
cabal-version field in the package description.  Also set the
default-language field of each component (to Haskell2010), which is
required in cabal >= v1.10 package description.

willdonnelly/dyre