Bump oas3

[supertong]

Watch out for warnings like this when bumping.

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Latest commit: 016259d

The changes in this PR will be included in the next version bump.

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Name	Type
koa-oas3	Major

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[lukiano]

Should we include 20?

[lukiano]

ctx.body = openapiUI({
        title: doc.info ? doc.info.title : 'openapi UI',
        url: config.endpoint,
        swaggerUiBundleBasePath: config.swaggerUiBundleBasePath
      });

I think we could cache the result of openapiUI()

[lukiano]

// Store coerced values
      ctx.oas = {
        request: {
          query: validRequest.query,
          params: validRequest.path,
          header: validRequest.header,
        },
        operationId: validRequest.operationId
      };

It seems that we're missing describing ctx.oas in the readme file.

[lukiano]

LGTM

[supertong]

Thanks @lukiano +++++ I will address those in a following up PR.