Was added to CONTRIBUTORS file in:

changeset:   7092:638ad4d7d280
user:        Berengar Lehr <Berengar.Lehr@gmx.de>
date:        Tue Jan 11 20:51:35 2011 -0500
summary:     crypto: add twofish package

but never added to AUTHORS file.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5532107