Update code style link

closes #142

Author: jaredpar

README.md

@@ -5,7 +5,7 @@
 CodeFormatter is a tool that uses Roslyn to automatically rewrite the source to
 follow our coding styles, which are [documented here][corefx-coding-style].
 
-[corefx-coding-style]: https://github.com/dotnet/corefx/blob/master/Documentation/coding-style.md
+[corefx-coding-style]: https://github.com/dotnet/corefx/blob/master/Documentation/coding-guidelines/coding-style.md
 
 ## Prerequisites