Add ReadTheDocs badge to README

lowell80 · lowell80 · commit 969ab4caae05 · 2019-02-14T17:57:45.000-05:00
diff --git a/README.md b/README.md
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 [![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)
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 # The Splunk Software Development Kit for Python
 
 #### Version 1.6.6
