Update README.md

Author: chrissmith-mcafee

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 # McAfee Threat Intelligence Exchange (TIE) DXL Python Client Library
-[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg?no_cache=true)](https://opensource.org/licenses/Apache-2.0)
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 
 ## Overview