Remove development warning

https://blog.dnsimple.com/2020/07/introducing-csharp-client/

README.md

@@ -5,14 +5,6 @@ A C# client for the [DNSimple API v2](https://developer.dnsimple.com/v2/).
 [![Build Status](https://github.com/dnsimple/dnsimple-csharp/actions/workflows/ci.yml/badge.svg)](https://github.com/dnsimple/dnsimple-csharp/actions/workflows/ci.yml)
 [![NuGet version](https://badge.fury.io/nu/dnsimple.svg)](https://badge.fury.io/nu/dnsimple)
 
-## :warning: Development Warning
-
-This project targets the development of the API client for the [DNSimple API v2](https://developer.dnsimple.com/v2/).
-
-This version is currently under development, therefore the methods and the implementation should he considered a work-in-progress. Changes in the method naming, method signatures, public or internal APIs may happen at any time.
-
-The code is tested with an automated test suite connected to a continuous integration tool, therefore you should not expect bugs to be merged into master. Regardless, use this library at your own risk.
-
 ## Installation
 
 Where `<version>` denotes the version of the client you want to install.