Sort AUTHORS and CONTRIBUTORS entries (#2192)

AUTHORS

diff --git a/AUTHORS b/AUTHORS
index 203961b..30a041a 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -74,7 +74,7 @@
 Steinar H. Gunderson <sgunderson@bigfoot.com>
 Stripe, Inc.
 Tobias Schmidt <tobias.schmidt@in.tum.de>
+XiaoWei Lu <shaway77606@gmail.com>
 Yixuan Qiu <yixuanq@gmail.com>
 Yusuke Suzuki <utatane.tea@gmail.com>
 Zbigniew Skowron <zbychs@gmail.com>
-XiaoWei Lu <shaway77606@gmail.com>

CONTRIBUTORS

diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index f0a4aa8..eabd85f 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -101,7 +101,7 @@
 Tobias Schmidt <tobias.schmidt@in.tum.de>
 Tobias Ulvgård <tobias.ulvgard@dirac.se>
 Tom Madams <tom.ej.madams@gmail.com> <tmadams@google.com>
+XiaoWei Lu <shaway77606@gmail.com>
 Yixuan Qiu <yixuanq@gmail.com>
 Yusuke Suzuki <utatane.tea@gmail.com>
 Zbigniew Skowron <zbychs@gmail.com>
-XiaoWei Lu <shaway77606@gmail.com>