Add Leo Neat to CONTRIBUTORS

"Google Inc." is already in AUTHORS.
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 348b878..f40f93c 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -35,4 +35,5 @@
 Andrew Dassonville <dassonville.andrew@gmail.com>
 Chris Palmer <chris@noncombatant.org>
 Jimmy Casey <casey.jimmy@gmail.com>
+Leo Neat <lneat@google.com>
 Nigel Tao <nigeltao@golang.org>