Auto merge of #64 - s-panferov:feature/to-json, r=oli-obk
Auto merge of #64 - s-panferov:feature/to-json, r=oli-obk

feat(value): create and impl ToJson trait

Refs #62

What do you think? Tests fail on `nightly`, but this seems unrelated.

bolinfest/serde-jsonrc,google/serde_json_lenient,serde-rs/json