message: Changelog for 0.30.0
diff: # Change Log
  +## Version 0.30.0 (2021-06-23)
  +
  +- Updated glutin to version 0.30.0. See the glutin release notes [here](https://github.com/rust-windowing/glutin/blob/master/CHANGELOG.md#version-0270-2021-06-01)
  +- Replaced unmaintained `rental` with `ouroboros`.
  +- Allow instancing on GLES3 or later.
  +- Support for importing and using Vulkan semaphores.
  +- Made `Content::read` an unsafe API.
  +- Modernized and fixed the third chapter of the tutorial.
  +
  ## Version 0.29.1 (2021-04-22)
  - Updated rand to 0.8.
  