v0.56.0-pre1

Changelog

• 1ea18e9 Pin linter version and fix nolintlint/gosec fix (#174)
• 9378fac Unwrap() has the option to force map keys to be strings (for go's json marshalling) and otherwise allow unwrap of maps with otherwise unhashable keys, avoid panics
• 13b2183 add pretty print optional argument to json_go
• 98173ec adding 2 tests