@hackage shikumi-cache-redis0.1.2.2

A Redis backend for shikumi's Cache effect (EP-6), kept in a separate package so the heavy hedis client and a running Redis server are only pulled in when actually used. Entries are stored under the string key shikumi:cache:<hex> with a configurable TTL; the value is the UTF-8 JSON of a CachedResponse (the Response round-trip comes from shikumi-cache's Shikumi.Cache.ResponseJSON).