HTML encode "registered trademark" symbols so they display properly

README.md

@@ -34,4 +34,4 @@ post about [structuring unit tests](http://haacked.com/archive/2012/01/01/struct
 * [GraphSharp](http://graphsharp.codeplex.com/) - [License: Ms-PL](http://graphsharp.codeplex.com/) Graph# is a graph layout framework. It contains some layout algorithms and a GraphLayout control for WPF applications
 * [Reactive Extensions](http://msdn.microsoft.com/en-us/data/gg577609) - [License: EULA](http://msdn.microsoft.com/en-us/devlabs/ff394099.aspx) The Reactive Extensions (Rx) is a library for composing asynchronous and event-based programs using observable sequences and LINQ-style query operators. 
 * [WPFExtensions](http://wpfextensions.codeplex.com/) - [License: Ms-PL](http://wpfextensions.codeplex.com/license) Some extensions for the WPF framework. Controls, attached behaviours, helper classes, etc.
-* [Windows� API Code Pack for Microsoft� .NET Framework](http://archive.msdn.microsoft.com/WindowsAPICodePack) - [License: EULA](http://archive.msdn.microsoft.com/WindowsAPICodePack/Project/License.aspx) provides a source code library that can be used to access some features of Windows 7 and Windows Vista from managed code.
+* [Windows® API Code Pack for Microsoft® .NET Framework](http://archive.msdn.microsoft.com/WindowsAPICodePack) - [License: EULA](http://archive.msdn.microsoft.com/WindowsAPICodePack/Project/License.aspx) provides a source code library that can be used to access some features of Windows 7 and Windows Vista from managed code.