json schema added through opt schemars crate

[dchagniot]

this add a feature called: schema

this optional feature add to each structure a : derive(JsonSchema).
This comes from the schemars crate.

A client using the maxminddb-rust crate is then able to generate
easily a json schema for all his structures who include a maxminddb structure.

[cetanu]

Curious, how would they generate the schema?

[dchagniot]

I use the schema_for! Macro from the schemar crate. It takes as argument a structure and generate a string containing the json schema.