v0.6.0a1

What's Changed

• support Server Variables by @commonism in #195
• tests/v30 - explicit test for various request/response error conditions by @commonism in #196
• doc - improve RequestBase by @commonism in #197
• openapi - schema ref nesting by @commonism in #198
• openapi - reference recursion fix by @commonism in #199
• Redfish requirements by @commonism in #204
• request - allow passing context to use in message plugins by @commonism in #205
• model - nullable schemas by @commonism in #208 #209 #211
• v30/glue - expected media lookup / as well by @commonism in #212
• openapi3 - resolve_jr by @commonism in #213
• v3x/parameter - improve support for applicators & nullable in parameters by @commonism in #214 #215

Full Changelog: v0.5.0...v0.6.0a1