Work CI-CD

- Update build badge.
- Remove preview mention.

***NO_CI***

Author: josesimoes

README.md

@@ -10,8 +10,7 @@
 
 | Component | Build Status | NuGet Package |
 |:-|---|---|
-| System.Net | [![Build Status](https://dev.azure.com/nanoframework/nanoFramework.System.Net/_apis/build/status/System.Net?repoName=nanoframework%2FSystem.Net&branchName=main)](https://dev.azure.com/nanoframework/nanoFramework.System.Net/_build/latest?definitionId=20&repoName=nanoframework%2FSystem.Net&branchName=main) | [![NuGet](https://img.shields.io/nuget/v/nanoFramework.System.Net.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.System.Net/) |
-| System.Net (preview) | [![Build Status](https://dev.azure.com/nanoframework/nanoFramework.System.Net/_apis/build/status/System.Net?repoName=nanoframework%2FSystem.Net&branchName=develop)](https://dev.azure.com/nanoframework/nanoFramework.System.Net/_build/latest?definitionId=20&repoName=nanoframework%2FSystem.Net&branchName=develop) | [![NuGet](https://img.shields.io/nuget/vpre/nanoFramework.System.Net.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.System.Net/) |
+| System.Net | [![Build Status](https://dev.azure.com/nanoframework/System.Net/_apis/build/status/System.Net?repoName=nanoframework%2FSystem.Net&branchName=main)](https://dev.azure.com/nanoframework/System.Net/_build/latest?definitionId=20&repoName=nanoframework%2FSystem.Net&branchName=main) | [![NuGet](https://img.shields.io/nuget/v/nanoFramework.System.Net.svg?label=NuGet&style=flat&logo=nuget)](https://www.nuget.org/packages/nanoFramework.System.Net/) |
 
 ## Feedback and documentation
 

azure-pipelines.yml

@@ -103,6 +103,8 @@ jobs:
         System.Net.Http
         System.Net.WebSockets
         System.Device.WiFi
+        System.Net.Sockets.TcpClient
+        System.Net.Sockets.UdpClient
         nanoFramework.m2mqtt
         nanoFramework.Azure.Devices