upd: Add bankart omnipay plugin to the list (thephpleague#603)

Co-authored-by: Alexander (SASh) Alexiev <alex@ampeco.global>

Author: sash

README.md

@@ -110,6 +110,7 @@ Gateway | 2.x | 3.x | Composer Package | Maintainer
 [Authorize.Net](https://github.com/thephpleague/omnipay-authorizenet) | ✓ | ✓ | omnipay/authorizenet | [Jason Judge](https://github.com/judgej)
 [Authorize.Net API](https://github.com/academe/omnipay-authorizenetapi) | - | ✓ | academe/omnipay-authorizenetapi | [Jason Judge](https://github.com/judgej)
 [Authorize.Net Recurring Billing](https://github.com/cimpleo/omnipay-authorizenetrecurring) | - | ✓ | cimpleo/omnipay-authorizenetrecurring | [CimpleO](https://github.com/cimpleo)
+[Bankart](https://github.com/ampeco/omnipay-bankart) | ✓ | ✓ | ampeco/omnipay-bankart | [Ampeco](https://github.com/ampeco)
 [Barclays ePDQ](https://github.com/digitickets/omnipay-barclays-epdq) | ✓ | - | digitickets/omnipay-barclays-epdq | [DigiTickets](https://github.com/digitickets)
 [Beanstream](https://github.com/lemonstand/omnipay-beanstream) | ✓ | - | lemonstand/omnipay-beanstream | [LemonStand](https://github.com/lemonstand)
 [BitPay](https://github.com/hiqdev/omnipay-bitpay) | ✓ | - | hiqdev/omnipay-bitpay | [HiQDev](https://github.com/hiqdev)