Tax Id Validator

This library validates tax identification numbers.

How to use

First you neeed to install the package via npm:

``
npm install --save tax-id-validator
`

`js
var taxValidator = require('tax-id-validator');
// validate has the follwing signature:
// validate(taxId, doNotValidate2015, doNotValidate2016), only taxId is required
var isValid = taxValidator.validate('44567139207');
`

The validate-method accepts only strings;

You can further specify wich versions of valid tax-ids you want to test,
because since 2016, another set of tax-ids is valid. You can use the optional parameters to
test for a specific version of the tax-id.

`js
// only validate pre 2016-ids
var isValid = taxValidator.validate('44567139207', false, true);
// only validate post 2016-ids
var isValid = taxValidator.validate('12345679998', true, false);
``