Update libpng to 1.2.38 to patch a minor security issue.
diff --git a/LICENSE b/LICENSE
index 50b4041..ddf3b5b 100644
--- a/LICENSE
+++ b/LICENSE
@@ -8,8 +8,10 @@
If you modify libpng you may insert additional notices immediately following
this sentence.
-libpng versions 1.2.6, August 15, 2004, through 1.2.35, February 14, 2009, are
-Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
+This code is released under the libpng license.
+
+libpng versions 1.2.6, August 15, 2004, through 1.2.38, July 16, 2009, are
+Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are
distributed according to the same disclaimer and license as libpng-1.2.5
with the following individual added to the list of Contributing Authors
@@ -106,4 +108,4 @@
Glenn Randers-Pehrson
glennrp at users.sourceforge.net
-February 14, 2009
+July 16, 2009