Update README.md

Update the EU URL API server

Author: marcos-albornoz

README.md

@@ -66,7 +66,7 @@ TPP REST APIs but please be advised this goes against Venafi recommendations.
 
 ## Prerequisites for using with Venafi as a Service
 
-1. The Venafi as a Service REST API is accessible at https://api.venafi.cloud or https://api.eu.venafi.cloud(if you have an EU account) from the system where VCert
+1. The Venafi as a Service REST API is accessible at [https://api.venafi.cloud](https://api.venafi.cloud/vaas) or [https://api.venafi.eu](https://api.venafi.eu/vaas) (if you have an EU account) from the system where VCert
 will be executed.
 2. You have successfully registered for a Venafi as a Service account, have been granted at least the
 "Resource Owner" role, and know your API key.