add cparsons and bttk to the CONTRIBUTORS file
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index fed38b9..a3eeb5b 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -11,8 +11,10 @@
Tony Allevato <allevato@google.com>
Jon Brandvein <brandjon@google.com>
-Nathan Herring <nherring@google.com>
-Laurent Le Brun <laurentlb@google.com>
+bttk <bttk@google.com>
+Chris Parsons <cparsons@google.com>
+Dave MacLachlan <dmaclach@google.com>
Dmitry Lomov <dslomov@google.com>
Jingwen Chen <jingwen@google.com>
-Dave MacLachlan <dmaclach@google.com>
+Laurent Le Brun <laurentlb@google.com>
+Nathan Herring <nherring@google.com>
