uniqueItems: true is not exposed in generated docs

[freddrake]

For arrays, setting uniqueItems to true is not reflected in the documentation, but should generally be considered important for a reader.

    type: array
    items:
      type: string
      enum:
        - "one"
        - "two"
        - "three"
    minItems: 1
    uniqueItems: true

Leaving this to the description leads to inconsistent and insufficient documentation.

[RomanHotsiy]

Thanks for the issue!

PR would be appreciated!

[freddrake]

The new version works perfectly for me; thank you!