You are setting a key that conflicts with a built-in method Apivore::Swagger#version

Rest of the error: 

`/$userpath/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/apivore-1.6.2/lib/apivore/swagger.rb:19.`

I assume it's talking about this line in my request spec: 

`subject { Apivore::SwaggerChecker.instance_for('/docs/swagger.json') }`

However to me it looks like it's setup exactly as the docs suggest. Seems like a bug with the gem.