Update CHANGELOG

CHANGELOG.md

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+## v0.4.0-beta.1
+
+- Lua 5.4 support with `MetaMethod::Close`.
+- Provide safety guaraness for Lua states which means that potenially unsafe operations like loading C modules (using `require` or `package.loadlib`) are disabled. Equalient for the previous `Lua::new()` function is `Lua::unsafe_new()`.
+- New `send` feature to require `Send`.
+- Don't allow `'callback` outlive `'lua` in `Lua::create_function()`. This fixes [the unsoundness](tests/compile/static_callback_args.rs).
+- Added `Lua::into_static()` to make `'static` Lua state. This is useful to spawn async Lua threads that requires `'static`.
+- New function `Lua::set_memory_limit()` (similar to `rlua`) to enable memory restrictions in Lua VM (requires Lua >= 5.2).
+- `Scope`, temporary removed in v0.3.0, is back with async support.
+- Removed deprecated `Table::call()`