hslua-classes: update changelog
`hslua-classes` uses [PVP Versioning][].
+## hslua-classes-2.2.0
+
+Released 2022-02-19.
+
+- Relaxed upper bounds, allowing hslua-core-2.2.0 and
+ hslua-marshalling-2.2.0.
+
## hslua-classes-2.1.0
-Released 29-01-2022.
+Released 2022-01-29.
- Updated to hslua-core 2.1 and hslua-marshalling 2.1.
