updated RELEASE_NOTES

RELEASE_NOTES.md

@@ -7,18 +7,24 @@ This file contains a high-level description of this package's evolution. Release
 
 ## 4.7.1 - TBD
 
+* [Enhancement] Added unit_test directory, which contains unit tests
+for the libdispatch and libsrc4 code (and any other directories that
+want to put unit tests there). Use --disable-unit-tests to run without
+unit tests (ex. for code coverage analysis).
+See [GitHub #1458](https://github.com/Unidata/netcdf-c/issues/1458)
+
 * [Bug Fix] Remove obsolete _CRAYMPP and LOCKNUMREC macros from
 code. Also brought documentation up to date in man page. These macros
 were used in ancient times, before modern parallel I/O systems were
 developed. Programmers interested in parallel I/O should see
 nc_open_par() and nc_create_par().
-See [GitHub #1436](https://github.com/Unidata/netcdf-c/issues/1459)
+See [GitHub #1459](https://github.com/Unidata/netcdf-c/issues/1459)
 
 * [Enhancement] Remove obsolete and deprecated functions
 nc_set_base_pe() and nc_inq_base_pe() from the dispatch table. (Both
 functions are still supported in the library, this is an internal
 change only.)
-See [GitHub #1436](https://github.com/Unidata/netcdf-c/issues/1468)
+See [GitHub #1468](https://github.com/Unidata/netcdf-c/issues/1468)
 
 * [Bug Fix] Reverted nccopy behavior so that if no -c parameters
 are given, then any default chunking is left to the netcdf-c library