hslua-core: Change newuserdata to newuserdatauv
`hslua-core` uses [PVP Versioning][].
+## hslua-core-2.2.0
+
+Release pending.
+
+- Use lua-2.2.0, which requires Lua 5.4.
+
+- Rename `newuserdata` to `newuserdatauv` and let it take the
+ number of associated uservalues as an additional argument.
+
## hslua-core-2.1.0
Released 29-01-2022.
