Remove link to contributing guide

The contributing guide links to the contributing guide. I think that explains it.

CONTRIBUTING.md

@@ -5,8 +5,6 @@ If you want to contribute code you can get started by looking for issues marked
 We also have the [easy](https://github.com/DotNetAnalyzers/StyleCopAnalyzers/labels/easy) tag
 for issues suitable if you are unfamiliar with roslyn.
 
-Also see the [contributing guide](CONTRIBUTING.md).
-
 You can also help by filing issues, participating in discussions and doing code review.
 
 ## Implementing a diagnostic
@@ -30,4 +28,4 @@ You can also help by filing issues, participating in discussions and doing code
 
 Visual Studio 2015 RC is required for building this repository.
 The Visual Studio 2015 RC SDK is required for building the vsix extension project and for
-debugging in an experimental visual studio hive.
+debugging in an experimental visual studio hive.