Update README.md

Author: a-l-h

README.md

@@ -45,7 +45,7 @@ readonly splunk_com_password="<password>"
 readonly splunkbase_apps=("<app_id> <app_version>" "<app_id> <app_version>")
 ```
 
-> **_Note:_**  Get an App or Add-on's ID from its Splunkase URL ``https://splunkbase.splunk.com/app/<app_id>/``.
+> **_Note:_**  Get an App or Add-on's ID from its Splunkase URL: ``https://splunkbase.splunk.com/app/<app_id>/``.
 
 #### If you want to retrieve files from an S3 bucket