Updated README.md

Removed defunct AppVeyor badge and added branch table for build status.

Author: kashimiz

README.md

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 # Durable Functions
 
-[![Build status](https://ci.appveyor.com/api/projects/status/rsoa2rrjxmd9h8i1?svg=true)](https://ci.appveyor.com/project/appsvc/azure-functions-durable-extension)
-[![Build Status](https://durabletaskframework.visualstudio.com/Durable%20Task%20Framework%20CI/_apis/build/status/Azure.azure-functions-durable-extension?branchName=dev)](https://durabletaskframework.visualstudio.com/Durable%20Task%20Framework%20CI/_build/latest?definitionId=15&branchName=dev)
+|Branch|Status|
+|---|---|
+|dev|[![Build Status](https://durabletaskframework.visualstudio.com/Durable%20Task%20Framework%20CI/_apis/build/status/Azure.azure-functions-durable-extension?branchName=dev)](https://durabletaskframework.visualstudio.com/Durable%20Task%20Framework%20CI/_build/latest?definitionId=15&branchName=dev)|
 
 Durable Functions is an extension that helps developers build reliable, stateful apps on the [Azure Functions](https://functions.azure.com) platform.