fix required struct tag when anonymous nested struct

[RedBoneZhang]

when use anonymous nested structures at @Param body，required stuct tag is invalid. struct define like follow:

type StructA struct {
   Name string `json:"name" required:"true"`
}

type StructB struct {
  StructA 
}

error: when use StructB in @Param，required struct tag is not generated in swagger.json.

[flycash]

Please fix the CI

[RedBoneZhang]

del.