<commit_before># Changelog

#### Unreleased<commit_msg>Update changelog<commit_after># Changelog

#### Unreleased

New Features:
 - The client now tracks consumer group coordinators using
   ConsumerMetadataRequests similar to how it tracks partition leadership using
   regular MetadataRequests ([#411](https://github.com/Shopify/sarama/pull/411)).
   This adds two methods to the client API:
   - `Coordinator(consumerGroup string) (*Broker, error)`
   - `RefreshCoordinator(consumerGroup string) error`
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