A+C: add Willem van der Schyff (Individual CLA).

R=golang-dev, bradfitz, dave
CC=golang-dev
https://golang.org/cl/6733047

AUTHORS

@@ -240,6 +240,7 @@ Vincent Vanackere <vincent.vanackere@gmail.com>
 Vinu Rajashekhar <vinutheraj@gmail.com>
 Volker Dobler <dr.volker.dobler@gmail.com>
 Wei Guangjing <vcc.163@gmail.com>
+Willem van der Schyff <willemvds@gmail.com>
 William Josephson <wjosephson@gmail.com>
 Xing Xing <mikespook@gmail.com>
 Yasuhiro Matsumoto <mattn.jp@gmail.com>

CONTRIBUTORS

@@ -342,6 +342,7 @@ Vinu Rajashekhar <vinutheraj@gmail.com>
 Vish Subramanian <vish@google.com>
 Volker Dobler <dr.volker.dobler@gmail.com>
 Wei Guangjing <vcc.163@gmail.com>
+Willem van der Schyff <willemvds@gmail.com>
 William Chan <willchan@chromium.org>
 William Josephson <wjosephson@gmail.com>
 Xing Xing <mikespook@gmail.com>