Nullable enums should contain the value null

[fantapop]

Currently the string "null" is added to nullable enums instead of the value. This results in code generation where the value is the string value null. This is described in more detail In the section on Nullable Enums here.

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Expected Behavior

MyNullableString:
  oneOf:
  - type: string
  - type: number
    enum:
    - null
    nullable: true

Current Behavior

MyNullableString:
  oneOf:
  - type: string
  - type: number
    enum:
    - 'null'
    nullable: true

Steps to Reproduce

1. Add a nullable type in an type used in a controller
2. build the swagger spec

Context (Environment)

Version of the library: 3.0.4
Version of NodeJS: 12.12

• Confirm you were using yarn not npm: [x]

Detailed Description

use the value null in nullable enums instead of the string "null"

Breaking change?

Breaking yes but V3 hasn't stabilized yet.