This release modernizes the bayesian library for modern Go:

- New Classify, ClassifyProb, ClassifySafe methods that return Class directly
  instead of an index (addresses #15)

- Added go.mod with Go 1.22 minimum version
- Added GitHub Actions CI (tests on Go 1.22 and 1.23)
- 100% test coverage
- Renamed WriteTo to WriteGob for clarity

- Fixed variadic argument forwarding in test helper
- Fixed typos in comments

- WriteTo method renamed to WriteGob
- Minimum Go version is now 1.22

Full documentation: https://pkg.go.dev/github.com/jbrukh/bayesian