feat: pass chunk as last event argument
feat: allow custom success status (200,201,202)

https://github.com/flowjs/flow.js/pull/52
feat: permanent errors for chunk test requests

https://github.com/flowjs/flow.js/issues/35
fix: large file upload progress handling
feat: custom http methods for chunk test and upload
fix: tests does not have retries
docs: new features documented