Add release note

Author: jhendersonHDF

release_docs/RELEASE.txt

@@ -514,6 +514,14 @@ Bug Fixes since HDF5-2.0.0 release
 ===================================
     Library
     -------
+    - Fixed an assertion failure in H5S__copy_pnt_list()
+
+      If a dataspace with a point selection in it had its extent reset with
+      the H5Sset_extent_none() function, any copy operations on that dataspace
+      would result in an assertion failure in debug builds of the library
+      due to the dataspace having an extent with a rank value of 0. This has
+      been fixed by converting the assertion failure into a normal error check.
+
     - Fixed an error in H5Ddebug
 
       H5Ddebug would fail for any chunked dataset with a chunk index, due to its