v0.2.1

Add package tests and CI/CD! v0.2.1

Primary changes regarding tests or CI/CD:

• Add package tests for main library
  • Do not (yet) have tests for tools or cmd
• Add CI job to test on trunk, tags, and PRs

Other (smaller) changes:

• Package
  • Add MIT license
  • Improve package documentation
• Library
  • Update generated TLD information
• writeTLDs
  • Call to writetlds.go on go generate
  • Add auto-generated message in tldconsts.go
  • Fix small bugs in writetlds.go
• ccTLDmissing
  • Ignore unicode (for now) in ccTLDmissing tool
• tldinfo (cmd)
  • Prefer library map over JSON parsing

Related MR: #3

Full Changelog: v0.2.0...v0.2.1