Version 2.2.0

What's Changed

• Relax order requirements for _parse_action_chains by @bbayles in #15
• Kinesis helpers by @bbayles in #2
• Bump version to 2.1.0 by @bbayles in #16
• Add dynamodb.batch_yield_items by @bbayles in #17

Full Changelog: v2.0.0...v2.2.0