Update README.md

code block on readme

Author: ArturU043

README.md

@@ -2,9 +2,9 @@
 This repository provides analysis tools to be used with the [ServiceX Client](https://github.com/ssl-hep/ServiceX_frontend/tree/master)
 
 ### To install 
-'''
+```
 pip install servicex-analysis-utils
-'''
+```
 
 ## Documentation
 The different functions are documented in [ServiceX Documentation](https://servicex-frontend.readthedocs.io)