Add support to MasterCard's 2-Series BINs

[andyautida14]

Here are some details regarding MasterCard's 2-Series BINs:
https://icepay.com/2016/08/04/mastercard-introduces-new-2-series-bin-range/

[coveralls]

Coverage remained the same at 99.104% when pulling 800dded on andyautida14:master into 9208844 on chriso:master.

[chriso]

Thanks.

[chriso]

The tests currently fail with:

  1) Validators should validate credit cards:
     Error: validator.isCreditCard(2222155765072228) failed but should have passed
      at test/validators.js:19:15
      at Array.forEach (native)
      at test (test/validators.js:14:19)
      at Context.<anonymous> (test/validators.js:1588:5)

[chriso]

Actually nm, you need to update src/lib/isCreditCard.js rather than the compiled lib/isCreditCard.js.