README.md link fix
README.md link fix

Azure/azure-notificationhubs-samples,Azure/azure-notificationhubs-samples,wesmc7777/azure-notificationhubs-samples,Azure/azure-notificationhubs-samples,wesmc7777/azure-notificationhubs-samples,Azure/azure-notificationhubs-samples,wesmc7777/azure-notificationhubs-samples,Azure/azure-notificationhubs-samples,Azure/azure-notificationhubs-samples,Azure/azure-notificationhubs-samples,Azure/azure-notificationhubs-samples,wesmc7777/azure-notificationhubs-samples,wesmc7777/azure-notificationhubs-samples,Azure/azure-notificationhubs-samples,wesmc7777/azure-notificationhubs-samples