Add a CHANGELOG entry for #323

Pull-request: #439

Signed-off-by: William Desportes <williamdes@wdes.fr>

Author: williamdes

CHANGELOG.md

@@ -12,6 +12,7 @@
 - Fix `ALTER TABLE … RENAME COLUMN … TO …` is not understood by the parser/linter (#430)
 - Fix `PARTITION` syntax errors (#377)
 - Fix `ALTER USER` when used with `IDENTIFIED WITH/VIA/BY` option (#431)
+- Fix `COALESCE PARTITION` in `ALTER TABLE`, rather than `COALESCE` (#323)
 
 ## [5.7.0] - 2023-01-25