Update README.md

Author: yadvr

README.md

@@ -12,7 +12,7 @@ To be able to find the API command you want, they are grouped by 'services' whic
 
 ## Usage
 
-The cloudstack package is always generated against the latest stable CloudStack release (currently v4.11.x). Luckily the API doesn't change that much, and were it does we try to make sure the generated package is able handle both the old and the new case. Over time it will be impossible to support all version with just one package, but until now we seem to manage this pretty well.
+The cloudstack package is always generated against the latest stable CloudStack release (currently v4.15.x). Luckily the API doesn't change that much, and were it does we try to make sure the generated package is able handle both the old and the new case. Over time it will be impossible to support all version with just one package, but until now we seem to manage this pretty well.
 
 Please see the package documentation on [go.dev](https://pkg.go.dev/github.com/apache/cloudstack-go/v2/cloudstack).