Update format_release_notes.rst (#418)

Author: rly

docs/format/source/format_release_notes.rst

@@ -1,12 +1,13 @@
 Release Notes
 =============
 
-2.2.2 (Upcoming)
+2.2.2 (March 2, 2020)
 ----------------
 
 - Fix shape and dims of `OpticalSeries.data` for color images
 - Allow more than one `OpticalChannel` object in `ImagingPlane`
 - Update hdmf-common-schema to 1.1.3. This fixes missing 'shape' and 'dims' key for types `VectorData`, `VectorIndex`, and `DynamicTableRegion`.
+- Revert changes to retinotopy.yaml in 2.1.0 which break backward compatibility and were not supported by the APIs in any case. Changes will be revisited in a future version. 
 
 2.2.1 (January 14, 2020)
 ------------------------