Updated onepay logo link [skip ci]

Author: vuongxuongminh

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-    <a href="https://momo.vn" target="_blank">
+    <a href="https://onepay.vn" target="_blank">
         <img src="https://raw.githubusercontent.com/phpviet/omnipay-onepay/master/resources/logo.png" height="100px">
     </a>
     <h1 align="center">Omnipay: OnePay</h1>