helm repo url update

Author: ahma

README.md

@@ -47,7 +47,7 @@ The following steps set up an example configuration for sending nginx logs to S3
 
 #### Add BanzaiCloud chart repository:
 ```bash
-$ helm repo add banzaicloud-stable http://kubernetes-charts.banzaicloud.com/branch/master
+$ helm repo add banzaicloud-stable https://kubernetes-charts.banzaicloud.com
 $ helm repo update
 ```