added blurb to RELEASE.txt

Author: bdbaddog

RELEASE.txt

@@ -31,6 +31,10 @@ CHANGED/ENHANCED EXISTING FUNCTIONALITY
   json output is also sorted, to match the default display.
 - Python 3.13 changes the behavior of isabs() on Windows. Adjust SCons
   usage of this in NodeInfo classes to avoid test problems.
+- Drop duplicated __getstate__ and __setstate__ methods in AliasNodeInfo,
+  FileNodeInfo and ValueNodeInfo classes, as they are identical to the
+  ones in parent NodeInfoBase and can just be inherited.
+
 
 FIXES
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