feat: new ValidatePromise decorator - resolve promise before validate

[queses]

Added new @ValidatePromise decorator to mark property as Promise that should to be resolved before validation.

Tests for new decorator lays in promise-validation.spec.ts.

Example of use:

class MySubClass {
  @MinLength(5)
  name: string;
}

class MyClass {
    @ValidatePromise() @ValidateNested()
    mySubClass: Promise<MySubClass>;
}

const model = new MyClass();
const mySubClass = new MySubClass();
mySubClass.name = "my";
model.mySubClass = Promise.resolve(mySubClass);

const errors = await validator.validate(model)
errors.length.should.be.equal(1);

errors[1].target.should.be.equal(model);
errors[1].property.should.be.equal("mySubClass");
errors[1].value.should.be.equal(await model.mySubClass);
expect(errors[1].constraints).to.be.undefined;

[queses]

Node v12 CI tests failed while v10 tests passed. Looks like library internal error.

[queses]

Also looks like I forgot to increase version in package.json.

[vlapo]

@queses could you please rebase? Tests should be fixed in latest commit.

[queses]

Yup, it's OK now

[vlapo]

Thank you! :)

[github-actions]

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