[devel] Corrected PNG_UNKNOWN_CHUNKS_SUPPORTED

to PNG_HANDLE_AS_UNKNOWN_SUPPORTED in gregbook/readpng2.c
diff --git a/ANNOUNCE b/ANNOUNCE
index 7adcab3..883c9e5 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -207,6 +207,8 @@
     The macro was documented with two arguments (name,ordinal), however
     the symbol checking .dfn files assumed five arguments.  The five
     argument form seems more useful so it is changed to that.
+  Corrected PNG_UNKNOWN_CHUNKS_SUPPORTED to PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+    in gregbook/readpng2.c
 
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