Adding my name to authors/contributors.

R=rsc
https://golang.org/cl/154169
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 7f9de1a..cc5f476 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -39,6 +39,7 @@
 David Symonds <dsymonds@golang.org>
 David Titarenco <david.titarenco@gmail.com>
 Devon H. O'Dell <devon.odell@gmail.com>
+Evan Shaw <chickencha@gmail.com>
 Ian Lance Taylor <iant@golang.org>
 Ivan Krasin <krasin@golang.org>
 Jacob Baskin <jbaskin@google.com>