Add @bquorning to our team listing

I just realized we forgot to do this in the past!

README.md

@@ -87,6 +87,7 @@ Here's a list of RuboCop's core developers:
 * [Masataka Kuwabara](https://github.com/pocke)
 * [Koichi Ito](https://github.com/koic)
 * [Maxim Krizhanovski](https://github.com/darhazer)
+* [Benjamin Quorning](https://github.com/bquorning)
 * [Marc-André Lafortune](https://github.com/marcandre)
 
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