================
**Bugfixes**
- Fixed bug when uploading to S3 with x-amz-acl header which caused
authentication failure - headers used in signature are now: host,
content-type and all `x-amz-*` headers (except for
x-amz-client-context which breaks Mobile Analytics auth if included)
**Docs**
- Minor docstring and comment updates
**License**
- Changed content of LICENSE to vanilla MIT license