update jedis dependency from 2.1.0 to 2.2.0.  Alleviates issue in using this plugin and the latest redis plugin, as documented here:
https://github.com/xetorthio/jedis/issues/303
Merge pull request #3 from dtanner/master

update jedis dependency from 2.1.0 to 2.2.0.  Alleviates issue in using ...