lib/time: update to IANA release 2015g.

Change-Id: Id82209dc313fa6b54e623eb325412737e7a055fe
Reviewed-on: https://go-review.googlesource.com/18794Reviewed-by: Andrew Gerrand <adg@golang.org>

lib/time/update.bash

@@ -5,10 +5,11 @@
 
 # This script rebuilds the time zone files using files
 # downloaded from the ICANN/IANA distribution.
+# Consult http://www.iana.org/time-zones for the latest versions.
 
 # Versions to use.
-CODE=2015e
-DATA=2015e
+CODE=2015g
+DATA=2015g
 
 set -e
 rm -rf work