v6.1.0

What's Changed

• refactor: moving unit tests over to jest by @erunion in #672
• feat: extend unit testing to node 20 by @erunion in #673
• feat(cli): adding a new --identifier option for supplying an SDK identifier by @erunion in #675
• fix(codegen): don't surface error responses as method return types by @erunion in #674

Full Changelog: v6.0.1...v6.1.0