Update Azure build badge

***NO_CI***

Signed-off-by: José Simões <[email protected]>

Author: josesimoes

README.md

@@ -1,4 +1,4 @@
-[![License](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT) [![#yourfirstpr](https://img.shields.io/badge/first--timers--only-friendly-blue.svg)](https://github.com/nanoframework/Home/blob/master/CONTRIBUTING.md) [![Build Status](https://dev.azure.com/nanoframework/metadata-processor/_apis/build/status/nanoframework.metadata-processor?branchName=master)](https://dev.azure.com/nanoframework/metadata-processor/_build/latest?definitionId=43&branchName=master) [![Discord](https://img.shields.io/discord/478725473862549535.svg)](https://discord.gg/gCyBu8T)
+[![License](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT) [![#yourfirstpr](https://img.shields.io/badge/first--timers--only-friendly-blue.svg)](https://github.com/nanoframework/Home/blob/master/CONTRIBUTING.md) [![Build Status](https://dev.azure.com/nanoframework/metadata-processor/_apis/build/status/nanoframework.metadata-processor?branchName=develop)](https://dev.azure.com/nanoframework/metadata-processor/_build/latest?definitionId=43&branchName=develop) [![Discord](https://img.shields.io/discord/478725473862549535.svg)](https://discord.gg/gCyBu8T)
 
 ![nanoFramework logo](https://github.com/nanoframework/Home/blob/master/resources/logo/nanoFramework-repo-logo.png)