CONTRIBUTORS: add Brad Fitzpatrick (Google Inc)

R=r, bradfitzpatrick
CC=golang-dev
https://golang.org/cl/1118041

Author: rsc

CONTRIBUTORS

@@ -44,6 +44,7 @@ Austin Clements <aclements@csail.mit.edu>
 Ben Eitzen <eitzenb@golang.org>
 Ben Olive <sionide21@gmail.com>
 Bill Neubauer <wcn@golang.org>
+Brad Fitzpatrick <brad@danga.com>
 Brendan O'Dea <bod@golang.org>
 Cary Hull <chull@google.com>
 Charles L. Dorian <cldorian@gmail.com>