Weightedrand Versions Save

Changelog

• chore: add go version to go.mod 1ddd4b2
• bench: add benchmark for NewChooser ffb4c67
• docs: Golang -> Go reference 510296d
• chore: add CI testing via github actions 2550322
• chore: remove travis-ci in favor of github actions f51c2c9
• chore: trivial syntax simplification in NewChooser b804acf
• chore: switch badge to github actions 95e277e

https://github.com/mroth/weightedrand/compare/v0.2.0...v0.2.1

• define Go Modules support
• clean up godocs
• guard against negative weights in Choice