Update README.md

* removed RTD references.
* updated Build Status to read from the GitHub CI
* added Reference doc's link

Author: ashah-splunk

README.md

@@ -1,5 +1,6 @@
-[![Build Status](https://travis-ci.org/splunk/splunk-sdk-python.svg?branch=master)](https://travis-ci.org/splunk/splunk-sdk-python)
-[![Documentation Status](https://readthedocs.org/projects/splunk-python-sdk/badge/?version=latest)](https://splunk-python-sdk.readthedocs.io/en/latest/?badge=latest)
+[![Build Status](https://github.com/splunk/splunk-sdk-python/actions/workflows/test.yml/badge.svg?branch=master)](https://github.com/splunk/splunk-sdk-python/actions/workflows/test.yml)
+
+[Reference Docs](https://dev.splunk.com/enterprise/reference)
 
 # The Splunk Enterprise Software Development Kit for Python