[Research] JSON schema

[dzemlianoi-double]

https://thoughtbot.com/blog/validating-json-schemas-with-an-rspec-matcher - is much more faster than json-matchers gem.

But it's not supporting Draft-07 specification.
Needs research how to do the fast specs running

More details: Alex Balobanov

[Volosh1n]

gem 'json_matchers', '0.10.0' seems the fastest one version of that gem