version to 0.2.0

* cleanups and standardizations (2919a08)
* Rename `RedisConnection` to `Connection` (#6)
* Update dependencies (290c17f)
* Allow building a `Connection` with a hash (#7)
* Add a `ConnectionSpy` (#8)
* Make `ConnectionSpy` and `RedisSpy` easier to extend (#9)

/cc @kellyredding