Update README: ruby gem badge

Author: ech0s7r

README.md

@@ -4,7 +4,7 @@
 [![](https://sonarcloud.io/api/project_badges/measure?project=Mastercard_client-encryption-ruby&metric=alert_status)](https://sonarcloud.io/dashboard?id=Mastercard_client-encryption-ruby)
 [![](https://sonarcloud.io/api/project_badges/measure?project=Mastercard_client-encryption-ruby&metric=coverage)](https://sonarcloud.io/dashboard?id=Mastercard_client-encryption-ruby)
 [![](https://sonarcloud.io/api/project_badges/measure?project=Mastercard_client-encryption-ruby&metric=vulnerabilities)](https://sonarcloud.io/dashboard?id=Mastercard_client-encryption-ruby)
-[![](https://badge.fury.io/rb/mastercard_client_encryption.svg)](https://badge.fury.io/rb/mastercard_client_encryption)
+[![](https://badge.fury.io/rb/mastercard-client-encryption.svg)](https://badge.fury.io/rb/mastercard-client-encryption)
 [![](https://img.shields.io/badge/license-MIT-yellow.svg)](https://github.com/Mastercard/client-encryption-ruby/blob/master/LICENSE)
 
 ## Table of Contents