Update changeset

Author: kevin-dp

.changeset/evil-pianos-hear.md

@@ -2,4 +2,4 @@
 '@electric-sql/d2mini': patch
 ---
 
-Modify index implementation to keep a map of consolidated values and their multiplicities. This improves efficiency to get a value's multiplicity since it's already precomputed.
+Modify index implementation to keep a map of consolidated values and their multiplicities. This improves efficiency to get a value's multiplicity since it's already precomputed. Also modify reduce operator to emit a single diff instead of 2 diffs (1 that is -oldMultiplicity and 1 that is +newMultiplicity).