Make Hedis the recommended Haskell client

[informatikr]

Hi,

(disclaimer: I am the author of Hedis)

please accept my patch to make Hedis the recommended Haskell client for the following reasons:

• Hedis is the only maintained client for Haskell. On Hackage, the Haskell package database, there are currently two other Redis clients ("redis" and "redis-hs") but both are no longer maintained. In fact the author of the "redis" client now recommends Hedis.
• Hedis has integration packages with the two major Haskell web frameworks, Snap and Yesod.
• Hedis supports the entire Redis 2.6 API (except MONITOR, SYNC, SHUTDOWN, DEBUG SEGFAULT).
• Hedis is quite fast.

Thanks for all your work on Redis!