add entry for 55

Author: alamb

CHANGELOG.md

@@ -28,6 +28,7 @@ technically be breaking and thus will result in a `0.(N+1)` version.
 
 
 - Unreleased: Check https://github.com/sqlparser-rs/sqlparser-rs/commits/main for undocumented changes.
+- `0.55.0`: [changelog/0.55.0.md](changelog/0.55.0.md)
 - `0.54.0`: [changelog/0.54.0.md](changelog/0.54.0.md)
 - `0.53.0`: [changelog/0.53.0.md](changelog/0.53.0.md)
 - `0.52.0`: [changelog/0.52.0.md](changelog/0.52.0.md)