update Glenn McGrath's email address

diff --git a/AUTHORS b/AUTHORS
index 8f6498b..9755ad9 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -95,7 +95,7 @@
 John Lombardo <john@deltanet.com>
     tr
 
-Glenn McGrath <bug1@iinet.net.au>
+Glenn McGrath <glenn.l.mcgrath@gmail.com>
     Common unarchiving code and unarchiving applets, ifupdown, ftpgetput,
     nameif, sed, patch, fold, install, uudecode.
     Various bugfixes, review and apply numerous patches.