Update README.md

README.md

@@ -5,6 +5,7 @@
 [![Build status](https://ci.appveyor.com/api/projects/status/9mgwu7obsuh89kys?svg=true)](https://ci.appveyor.com/project/wieslawsoltes/reactivehistory)
 [![Build Status](https://travis-ci.org/wieslawsoltes/ReactiveHistory.svg?branch=master)](https://travis-ci.org/wieslawsoltes/ReactiveHistory)
 [![CircleCI](https://circleci.com/gh/wieslawsoltes/ReactiveHistory/tree/master.svg?style=svg)](https://circleci.com/gh/wieslawsoltes/ReactiveHistory/tree/master)
+[![Build Status](https://dev.azure.com/wieslawsoltes/ReactiveHistory/_apis/build/status/wieslawsoltes.ReactiveHistory)](https://dev.azure.com/wieslawsoltes/ReactiveHistory/_build/latest?definitionId=1)
 
 [![NuGet](https://img.shields.io/nuget/v/ReactiveHistory.svg)](https://www.nuget.org/packages/ReactiveHistory) [![MyGet](https://img.shields.io/myget/reactivehistory-nightly/vpre/ReactiveHistory.svg?label=myget)](https://www.myget.org/gallery/reactivehistory-nightly)