Add mdlayher to AUTHORS and CONTRIBUTORS

AUTHORS

@@ -15,4 +15,5 @@ Gabriel Aszalos <gabriel.aszalos@gmail.com> github=gbbr
 Google, Inc.
 Keith Rarick <kr@xph.us> github=kr
 Matthew Keenan <tank.en.mate@gmail.com> <github@mattkeenan.net> github=mattkeenan
+Matt Layher <mdlayher@gmail.com> github=mdlayher
 Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com> github=tatsuhiro-t

CONTRIBUTORS

@@ -15,4 +15,5 @@ Daniel Morsing <daniel.morsing@gmail.com> github=DanielMorsing
 Gabriel Aszalos <gabriel.aszalos@gmail.com> github=gbbr
 Keith Rarick <kr@xph.us> github=kr
 Matthew Keenan <tank.en.mate@gmail.com> <github@mattkeenan.net> github=mattkeenan
+Matt Layher <mdlayher@gmail.com> github=mdlayher
 Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com> github=tatsuhiro-t