large public build no longer exists. basing badge off the last 'core'…

… build (#7000)

README.md

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 # Azure SDK for Python
 
-[![Python](https://img.shields.io/pypi/pyversions/azure-core.svg?maxAge=2592000)](https://pypi.python.org/pypi/azure/) [![BuildStatus](https://dev.azure.com/azure-sdk/public/_apis/build/status/46?branchName=master)](https://dev.azure.com/azure-sdk/public/_build/latest?definitionId=46&branchName=master) [![Dependencies](https://img.shields.io/badge/dependencies-analyzed-blue.svg)](https://azuresdkartifacts.blob.core.windows.net/azure-sdk-for-python/dependencies/dependencies.html)
+[![Python](https://img.shields.io/pypi/pyversions/azure-core.svg?maxAge=2592000)](https://pypi.python.org/pypi/azure/) [![Build Status](https://dev.azure.com/azure-sdk/public/_apis/build/status/python/python%20-%20core%20-%20ci?branchName=master)](https://dev.azure.com/azure-sdk/public/_build/latest?definitionId=458&branchName=master) [![Dependencies](https://img.shields.io/badge/dependencies-analyzed-blue.svg)](https://azuresdkartifacts.blob.core.windows.net/azure-sdk-for-python/dependencies/dependencies.html)
 
 This repository contains official Python libraries for Azure services. For documentation go to [Azure SDK for Python documentation](http://aka.ms/python-docs).