Fixed nuget package name in readme

Author: gigi81

README.md

@@ -1,5 +1,5 @@
 ![System.IO.Abstractions.Extensions](https://socialify.git.ci/System-IO-Abstractions/System.IO.Abstractions.Extensions/image?description=1&font=Source%20Code%20Pro&forks=1&issues=1&pattern=Charlie%20Brown&pulls=1&stargazers=1&theme=Dark)
-[![NuGet](https://img.shields.io/nuget/v/System.IO.Abstractions.Extensions.svg)](https://www.nuget.org/packages/System.IO.Abstractions.Extensions)
+[![NuGet](https://img.shields.io/nuget/v/TestableIO.System.IO.Abstractions.Extensions.svg)](https://www.nuget.org/packages/TestableIO.System.IO.Abstractions.Extensions)
 ![Continuous Integration](https://github.com/System-IO-Abstractions/System.IO.Abstractions.Extensions/workflows/Continuous%20Integration/badge.svg)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/2e777fa545c94767acccd6345b1ed9b7)](https://app.codacy.com/gh/System-IO-Abstractions/System.IO.Abstractions.Extensions?utm_source=github.com&utm_medium=referral&utm_content=System-IO-Abstractions/System.IO.Abstractions.Extensions&utm_campaign=Badge_Grade_Dashboard)
 [![Renovate enabled](https://img.shields.io/badge/renovate-enabled-brightgreen.svg)](https://renovatebot.com/)
@@ -8,5 +8,5 @@
 Convenience functionality on top of System.IO.Abstractions
 
 ```shell
-dotnet add package System.IO.Abstractions.Extensions
+dotnet add package TestableIO.System.IO.Abstractions.Extensions
 ```