Release version 0.0.13

Release version 0.0.12

- Fixed test failures when users have custom init.defaultBranch git configuration (#47)

Release version 0.0.11

- Upgraded git2 dependency from 0.19.0 to 0.20.2
- Updated libgit2-sys to 0.18.2+1.9.1

Release version 0.0.10

- Add CHANGELOG.md
- Fix help message argument order
- Add PR command functionality
- Fix PR --draft and --web flag interoperability
- Use CARGO_PKG_VERSION for version string
- Various test fixes and improvements