What's Changed
* Make `data` input to `_compose_parser` optional by bruno-f-cruz in https://github.com/harp-tech/harp-python/pull/46
* Replace license classifier with SPDX expression by glopesdev in https://github.com/harp-tech/harp-python/pull/47
**Full Changelog**: https://github.com/harp-tech/harp-python/compare/v0.4.0...v0.4.1