Update README.md

Author: nullconfig

stable/README.md

@@ -6,7 +6,7 @@ Please refer to Helm's [documentation](https://helm.sh/docs/) to get started.
 Once Helm is set up properly, add the repo as follows:
 
 ```console
-helm repo add phpipam https://nullconfig.github.io/phpipam/stable/
+helm repo add phpipam https://nullconfig.github.io/phpipam/stable
 ```
 You can then run `helm search repo phpipam` to see the charts.