update CHANGELOG

Author: stephprince

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## PyNWB 3.1.3 (Unreleased)
 
+### Added
+- Added 'target_tables' kwarg to DynamicTable subclasses to allow classes that extend DynamicTable subclasses to specify the mapping of DynamicTableRegion columns to the target tables. @rly [#2096](https://github.com/NeurodataWithoutBorders/pynwb/issues/2096)
+
 ### Fixed
 - Fixed incorrect warning for path not ending in `.nwb` when no path argument was provided. @t-b [#2130](https://github.com/NeurodataWithoutBorders/pynwb/pull/2130)
 - Fixed issue with setting `neurodata_type_inc` when reading NWB files with cached schema versions less than 2.2.0. @rly [#2135](https://github.com/NeurodataWithoutBorders/pynwb/pull/2135)