[libpng16] Revised example.c to illustrate use of PNG_DEFAULT_sRGB and

PNG_GAMMA_MAC_18 as parameters for png_set_gamma().

CHANGES

diff --git a/CHANGES b/CHANGES
index a64e061..5bf2576 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4589,7 +4589,10 @@
 Version 1.6.3beta08 [June 18, 2013]
   Revised libpng.3 so that "doclifter" can process it.
 
-Version 1.6.3beta09 [June 18, 2013]
+Version 1.6.3beta09 [June 26, 2013]
+  Revised example.c to illustrate use of PNG_DEFAULT_sRGB and PNG_GAMMA_MAC_18
+    as parameters for png_set_gamma().  These have been available since
+    libpng-1.5.4.
 
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