Update log for v0.2.1

CellArr · Jan 29, 2025 · d3cc814 · d3cc814
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 # Changelog
 
+## Version 0.2.1
+
+- The aggregate function is expected to return either a scalar value or a 1-dimensional NumPy ndarray. If the later, users need to specify the expected dimension of the summarization. All values will be flattenned eventually.
+
 ## Version 0.2.0
 
 - chore: Remove Python 3.8 (EOL)