Update rule set link to docs.microsoft.com location

Author: davidvesely

README.md

@@ -15,7 +15,7 @@ This repository contains an implementation of the StyleCop rules using the .NET
 The preferable way to use the analyzers is to add the nuget package [StyleCop.Analyzers](http://www.nuget.org/packages/StyleCop.Analyzers/)
 to the project where you want to enforce StyleCop rules.
 
-The severity of individual rules may be configured using [rule set files](https://msdn.microsoft.com/en-us/library/dd264996.aspx)
+The severity of individual rules may be configured using [rule set files](https://docs.microsoft.com/en-us/visualstudio/code-quality/using-rule-sets-to-group-code-analysis-rules)
 in Visual Studio 2015 or newer. **Settings.StyleCop** is not supported, but a **stylecop.json** file may be used to
 customize the behavior of certain rules. See [Configuration.md](documentation/Configuration.md) for more information.