Add new usage to README
Merge branch 'develop' into feature/zadd
Merge branch 'develop' into feature/zadd
Update README for Tame
Change test file name
Add test for Tame (to fail)
Add skel of `Group`
Add `Group.Count`
Change method name
Fix typo
Add test for Tame (to fail)
Improve error handling, avoiding `panic`
Add new command `ZADD` to protocol/redis
Use `ZADD` of redis when `Group.Add`
Add `ZCOUNT` command in redis protocol (still fail)
Support `zadd` adn `zrange`
Fix README
Remove playground
Merge pull request #13 from otiai10/feature/zadd

Feature/zadd