cache: add dependencies to contract
- infos = Information about the cache plugin is in keys below
- infos/author = Mihael Pranjic <mpranj@limun.org>
- infos/licence = BSD
-- infos/needs =
+- infos/needs = resolver mmapstorage
- infos/provides =
- infos/recommends =
- infos/placements = pregetcache postgetcache
