object renames do not appear in describe api.

[WesTyler]

Context

• node version: 4.4.0, 4.5.0, 6.9.0
• joi version: 9.2.0
• environment (node, browser): node
• used with (hapi, standalone, ...): standalone
• any other relevant information:

What are you trying to achieve or the steps to reproduce ?

We are building a utility around Joi schema, utilizing the describe() api. Our expectation is that actions that modify/mutate properties should appear in the describe'ed schema.

const schema = Joi.object().keys({b: Joi.number()}).rename('a', 'b');
const schemaDescription = schema.describe();

Which result you had ?

//schemaDescription:
{ 
    type: 'object',
    children: { 
        b: { type: 'number', invalids: [ Infinity, -Infinity ] }
    }
}

What did you expect ?

Some property in schemaDescription.children.b that indicates a rename has been defined.

[WesTyler]

If any maintainers agree with my assumption that this should be in the describe'd output, I can make a PR to add this functionality. Just let me know :)

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