docs: Add a missing changelog entry

Stranger6667 · Stranger6667 · commit 8d1d59841376 · 2021-10-09T09:59:56.000+02:00
Signed-off-by: Dmitry Dygalo &lt;dadygalo@gmail.com&gt;
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -21,6 +21,10 @@
 
 - Display the original value in errors from `minimum`, `maximum`, `exclusiveMinimum`, `exclusiveMaximum`. [#215](https://github.com/Stranger6667/jsonschema-rs/issues/215)
 
+### Performance
+
+- Reduce the size of `PrimitiveTypesBitMapIterator` from 3 to 2 bytes. [#282](https://github.com/Stranger6667/jsonschema-rs/issues/282)
+
 ## [0.12.1] - 2021-07-29
 
 ### Fixed
