CONTRIBUTORS: add Andreas Schwab

Change-Id: Iaeb4bafc60941eccdd46dda5c495cc0f7f51b0af
Reviewed-on: https://go-review.googlesource.com/45070
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index c9b3fdc..264751a 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -28,6 +28,7 @@
 
 Alexander Shopov <ash@kambanaria.org> <ash%kambanaria.org@gtempaccount.com>
 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
+Andreas Schwab <schwab@suse.de>
 Andrew Wilkins <axwalk@gmail.com>
 Chris Manghane <cmang@golang.org>
 Christopher Wedgwood <cw@f00f.org>