Update README.md

Author: akaszynski

README.md

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 [![PyPI version](https://badge.fury.io/py/ansys-dpf-core.svg)](https://badge.fury.io/py/ansys-dpf-core)
 
-[![Build Status](https://dev.azure.com/pyansys/pyansys/_apis/build/status/pyansys.DPF-Core?branchName=docs%2Foperators)](https://dev.azure.com/pyansys/pyansys/_build/latest?definitionId=2&branchName=docs%2Foperators)
+[![Build Status](https://dev.azure.com/pyansys/pyansys/_apis/build/status/pyansys.DPF-Core?branchName=master)](https://dev.azure.com/pyansys/pyansys/_build/latest?definitionId=2&branchName=master)
 
 The Data Processing Framework (DPF) is designed to provide numerical
 simulation users/engineers with a toolbox for accessing and