Move to using json_schemer gem for newer specifications

[ttanay]

The json-schema ruby gem doesn't newer specifications of the JSON schema, specifically draft 7 that I want to use. Draft 7 has useful features that I'd like to use along with this gem, but, it's not possible due to the JSON schema validation gem that this uses.
Also, looks like the json-schema gem is not being maintained.
Is it possible to switch to another gem like json_schemer that supports newer specifications?

Happy to take up the change if you decide to go ahead with it.

[amygurski]

I don't know if there is interest in this, but we ran into this issue as well - our app recently started using draft 6 (previously it was just draft 4) and it broke. I started work on a PR just in case there is interest in moving forward with your lovely suggestion @ttanay : #46

[remi]

I merged #46 and released activerecord_json_validator-2.0.0! 🎉

Thanks again Amy!