Update README.md

Changed the link to nuget for the package for the non-deprecated location.

Author: rstradling

README.md

@@ -1,7 +1,7 @@
 [![Issue Stats](http://issuestats.com/github/fsprojects/fsharpx/badge/issue)](http://issuestats.com/github/fsprojects/fsharpx)
 [![Issue Stats](http://issuestats.com/github/fsprojects/fsharpx/badge/pr)](http://issuestats.com/github/fsprojects/fsharpx)
 
-# FSharpx.Extras [![NuGet Status](http://img.shields.io/nuget/v/FSharpx.Extras.svg?style=flat)](https://www.nuget.org/packages/FSharpx.Core/)
+# FSharpx.Extras [![NuGet Status](http://img.shields.io/nuget/v/FSharpx.Extras.svg?style=flat)](https://www.nuget.org/packages/FSharpx.Extras)
 
 **FSharpx.Extras** is a collection of libraries and tools for use with F#.