v0.3.0 - Fix README on PyPi
Add `README.md` description on PyPi (#26)
* Remove testing notebook
* Update version to 0.3.0, include authors and email, add description and long description content type, and include URL
- Updated the version in the setup.py file from 0.2.0 to 0.3.0 to reflect the current release.
- Added the authors' names and email addresses to provide contact information.
- Included a short description of the project, "Generate commit messages with OpenAI's GPT."
- Specified the long description in the README.md file and set the content type to "text/markdown" for proper rendering on project platforms.
- Provided the URL of the project repository, "https://github.com/heyodai/magic-commit", to give users easy access to the source code and project information.