added link to omnipay-wirecard driver

Author: igaponov

README.md

@@ -145,6 +145,7 @@ Gateway | Composer Package | Maintainer
 [Skrill](https://github.com/alfaproject/omnipay-skrill) | alfaproject/omnipay-skrill | [João Dias](https://github.com/alfaproject)
 [Stripe](https://github.com/thephpleague/omnipay-stripe) | omnipay/stripe | [Kayla Daniels](https://github.com/kayladnls)
 [TargetPay](https://github.com/thephpleague/omnipay-targetpay) | omnipay/targetpay | [Alexander Deruwe](https://github.com/aderuwe)
+[Wirecard](https://github.com/igaponov/omnipay-wirecard) | igaponov/omnipay-wirecard | [Igor Gaponov](https://github.com/igaponov)
 [WorldPay](https://github.com/thephpleague/omnipay-worldpay) | omnipay/worldpay | [Kayla Daniels](https://github.com/kayladnls)
 [WorldPay XML Direct](https://github.com/teaandcode/omnipay-worldpay-xml) | teaandcode/omnipay-worldpay-xml | [Dave Nash](https://github.com/teaandcode)
 [Veritrans](https://github.com/andylibrian/omnipay-veritrans) | andylibrian/omnipay-veritrans | [Andy Librian](https://github.com/andylibrian)