dev-haskell/criterion: Mask incompatible new hastache version

hastache-0.6.0 breaks its users by converting the API from ByteString to
Text. Until a new, compatible criterion version is released, just
explicitly depend on hastache-0.5.0.
Merge pull request #312 from atlaua/pu2

dev-haskell/criterion: Mask incompatible new hastache version