Hi, thanks for the great library.

I noticed that some types are missing properties for swagger v2 spec. This are the missing properties that I observed:

openapi2.T

• produces

openapi2.Operation

• schemes

openapi2.Header (probably should take all the openapi2.Parameter properties similarly to openapi3)

• format
• maxLength
• minLength
• maxItems
• minItems
• minimum
• maximum
• pattern
• items