Having an additional Client has added some confusion (https://github.com/harlow/kinesis-consumer/issues/45) on how to provide a
custom kinesis client. Allowing `WithClient` to accept a Kinesis client
it cleans up the interface.
Major changes:
* Remove the Client wrapper; prefer using kinesis client directly
* Change `ScanError` to `ScanStatus` as the return value isn't necessarily an error
Note: these are breaking changes, if you need last stable release please see here: https://github.com/harlow/kinesis-consumer/releases/tag/v0.2.0
The previous pipeline model required a lot of setup and abstracted away
the processing of records. By passing a HandlerFunc to the consumer we
keep the business logic of processing of records closer to the use of
the consumer.
* Add refactoring note and SHA to README
For situations where we don't want any logs produced by the application.
* Remove references to Logger from README
* Add implementation of DiscardLogger
To allow for different logging endpoints we'll introduce a Logger
interface that will be passed into the pipeline during initialization.
* Add Logger interface
* Use logger interface in pipeline and emitters
