Add description to Hackage of what the package does

[Rembane]

Good morning,

The description of the package on Hackage does not say what this implementation of the package does, it references the old package instead. This makes me confused. :/

https://hackage.haskell.org/package/blaze-builder

[andreasabel]

Fixed in 0.4.2.2.

Maintenance moved to https://github.com/blaze-builder/blaze-builder