message: Update the changelog (re: readme)
diff: - Globals no longer creates a `lazy_static` per global.
  - Unsafe `ObjectClass::cast()` has been renamed to `ObjectClass::cast_unchecked()`.
  - Bump `winreg` (Windows only) to 0.10, `pretty_assertions` (dev) to 1.0.
  +- Updated the example in the readme to showcase the new features.
  ### Fixed
  