Remove old package badge from readme.

ReadMe.md

@@ -1,6 +1,5 @@
 [![Build](https://img.shields.io/appveyor/ci/SolalPirelli/ThriftSharp.svg?style=flat-square)](https://ci.appveyor.com/project/SolalPirelli/ThriftSharp)
 [![NuGet Package](https://img.shields.io/nuget/v/ThriftSharp.svg?style=flat-square&label=ThriftSharp)](https://www.nuget.org/packages/ThriftSharp/)
-[![NuGet Package](https://img.shields.io/nuget/v/ThriftSharp.Extensions.svg?style=flat-square&label=ThriftSharp.Extensions)](https://www.nuget.org/packages/ThriftSharp.Extensions/)
 
 **Thrift#** is an implementation of the [Thrift protocol](http://thrift.apache.org/) for .NET.
 
@@ -9,4 +8,4 @@ This allows complete freedom over the types, and enables interesting features su
 
 Read the [documentation](https://github.com/SolalPirelli/ThriftSharp/wiki) to get started.
 
-Pull requests, bug reports and suggestions are welcome.
+Pull requests, bug reports and suggestions are welcome.