Object schema without

[victortosts]

This pull request adds 'without' method to ObjectSchema;

Sometimes when you have a large Fluent Schema becomes difficult to reuse it selecting only some of its properties. It makes more sense to reuse by removing properties you don't want to keep.

Example:

const S = require('fluent-json-schema')
const personSchema = S.object()
  .prop('id', S.string().format('uuid'))
  .prop('name', S.string())
  .prop('age', S.number())
  .prop('gender', S.string())
  .prop(
            'address',
            S.object()
              .prop('city', S.string())
              .prop('street', S.string())
              .prop('zipCode', S.string())
          )
  .prop('profession', S.string())
  .prop('createdAt', S.string().format('time'))
  .prop('updatedAt', S.string().format('time'))

// looks better
const bodySchema = personSchema.without(['createdAt', 'updatedAt'])

// then this
const bodySchema = personSchema.only(['id', 'name', 'age', 'gender', 'address', 'profession'])

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[mcollina]

lgtm

[coveralls]

Pull Request Test Coverage Report for Build 1669904525

• 0 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 99.57%

---

Totals
Change from base Build 1555567555:	0.002%
Covered Lines:	423
Relevant Lines:	423

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 1669904525

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 99.57%

---

Totals
Change from base Build 1555567555:	0.002%
Covered Lines:	423
Relevant Lines:	423

---

💛 - Coveralls

[aboutlo]

tks @victortostes-hotmart for this!