Fixed
- Fixed an issue when evaluate `in/not in` markers ([188](https://github.com/python-poetry/poetry-core/pull/188)).
- Fixed an issue when parsing of caret constraint with leading zero ([201](https://github.com/python-poetry/poetry-core/pull/201)).
- Respect format for explicit included files when finding excluded files ([228](https://github.com/python-poetry/poetry-core/pull/228)).
- Fixed an issue where only the last location was used when multiple packages should be included ([108](https://github.com/python-poetry/poetry-core/pull/108)).
- Ensure that package `description` contains no new line ([219](https://github.com/python-poetry/poetry-core/pull/219)).
- Fixed an issue where all default dependencies were removed instead of just the selected one ([220](https://github.com/python-poetry/poetry-core/pull/220)).
- Ensure that authors and maintainers are normalized ([276](https://github.com/python-poetry/poetry-core/pull/276)).
Added
- Add support for most of the guaranteed hashes ([207](https://github.com/python-poetry/poetry-core/pull/207)).
- Add support to declare multiple README files ([248](https://github.com/python-poetry/poetry-core/pull/248)).
- Add support for git sub directories ([192](https://github.com/python-poetry/poetry-core/pull/192)).
- Add hooks according to PEP-660 for editable installs ([182](https://github.com/python-poetry/poetry-core/pull/182)).
- Add support for version epochs ([264](https://github.com/python-poetry/poetry-core/pull/264)).
Changed
- Drop python3.6 support ([263](https://github.com/python-poetry/poetry-core/pull/263)).
- Loose the strictness when parsing version constraint to support invalid use of wildcards, e.g. `>=3.*` ([186](https://github.com/python-poetry/poetry-core/pull/186)).
- No longer assume a default git branch name ([192](https://github.com/python-poetry/poetry-core/pull/192)).
- Sort package name in extras to make it reproducible ([280](https://github.com/python-poetry/poetry-core/pull/280)).
Improvements
- Improve marker handling ([208](https://github.com/python-poetry/poetry-core/pull/208),
[282](https://github.com/python-poetry/poetry-core/pull/282),
[283](https://github.com/python-poetry/poetry-core/pull/283),
[284](https://github.com/python-poetry/poetry-core/pull/284),
[286](https://github.com/python-poetry/poetry-core/pull/286),
[291](https://github.com/python-poetry/poetry-core/pull/291),
[293](https://github.com/python-poetry/poetry-core/pull/293),
[294](https://github.com/python-poetry/poetry-core/pull/294),
[297](https://github.com/python-poetry/poetry-core/pull/297)).