Update CHANGELOG.md

CHANGELOG.md

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 # PyNWB Changelog
 
+## PyNWB 3.0.0 (Upcoming)
+
+### Enhancements and minor changes
+- Added support for NWB schema 2.8.0:
+  - Fixed support for `data__bounds` field to `SpatialSeries` to set optional boundary range (min, max) for each dimension of data. Removed `SpatialSeries.bounds` field that was not functional. @rly [#1907](https://github.com/NeurodataWithoutBorders/pynwb/pull/1907)
+
 ## PyNWB 2.8.3 (Upcoming)
 
 ### Performance
@@ -29,7 +35,6 @@
 
 ### Bug fixes
 - Fixed use of `channel_conversion` in `TimeSeries` `get_data_in_units`. @rohanshah [1923](https://github.com/NeurodataWithoutBorders/pynwb/pull/1923)
-- Fix support for `data__bounds` field to `SpatialSeries` to set optional boundary range (min, max) for each dimension of data. @rly [#1907](https://github.com/NeurodataWithoutBorders/pynwb/pull/1907)
 
 ## PyNWB 2.8.0 (May 28, 2024)