[libpng15] Reject invalid compression flag, method when reading the iTXt chunk.

CHANGES

diff --git a/CHANGES b/CHANGES
index 752961c..8242dbe 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3750,7 +3750,7 @@
     (Frank Busse).
   Allow row_stride==0 to indicate default stride in simplified API.
   Added MINGW support to CMakeLists.txt
-  Reject invalid compression flag when reading the iTXt chunk.
+  Reject invalid compression flag or method when reading the iTXt chunk.
 
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