Update release notes

Author: DennisHeimbigner

RELEASE_NOTES.md

@@ -7,7 +7,7 @@ This file contains a high-level description of this package's evolution. Release
 
 ## 4.8.2 - TBD
 
-* [Enhancement] Improve filter support. More specifically (1) add nc_inq_filter_avail to check if a filter is available, (2) add the notion of standard filters, (3) cleanup szip support to fix interaction with NCZarr. See [Github #????](https://github.com/Unidata/netcdf-c/pull/????).
+* [Enhancement] Improve filter support. More specifically (1) add nc_inq_filter_avail to check if a filter is available, (2) add the notion of standard filters, (3) cleanup szip support to fix interaction with NCZarr. See [Github #2245](https://github.com/Unidata/netcdf-c/pull/2245).
 * [Bug Fix] Require that the type of the variable in nc_def_var_filter is not variable length. See [Github #/2231](https://github.com/Unidata/netcdf-c/pull/2231).
 * [File Change] Apply HDF5 v1.8 format compatibility when writing to previous files, as well as when creating new files.  The superblock version remains at 2 for newly created files.  Full backward read/write compatibility for netCDF-4 is maintained in all cases.  See [Github #2176](https://github.com/Unidata/netcdf-c/issues/2176).
 * [Enhancement] Add ability to set dataset alignment for netcdf-4/HDF5 files. See [Github #2206](https://github.com/Unidata/netcdf-c/pull/2206).