- <csr-id-5a78577310a1064ae8f28de80ea076108fbc8d96/> bump version to 0.3.0 to adapt smart-release
### Chore
- add CHANGELOG
### New Features
- add FelgensResult and FelgensError to handle Error
### Other
- <csr-id-d9f55d7e5bf119c4bbfd7858551433a6842085ff/> improve some function return type
### Commit Statistics
- 5 commits contributed to the release over the course of 111 calendar days.
- 111 days passed between releases.
- 4 commits were understood as [conventional](https://www.conventionalcommits.org).
- 0 issues like '(#ID)' were seen in commit messages
### Commit Details
* **Uncategorized**
- Add CHANGELOG (0169528)
- Bump version to 0.3.0 to adapt smart-release (5a78577)
- Add FelgensResult and FelgensError to handle Error (99c4b1a)
- Improve some function return type (d9f55d7)
- (cargo-release) start next development iteration 0.2.2-alpha.0 (52740cc)