message: Updated readme with current status
diff: [![](http://meritbadge.herokuapp.com/glium)](https://crates.io/crates/glium)
  +## Note to current and future Glium users:
  +
  +Glium is no longer maintained, for more information visit the [post-mortem](https://users.rust-lang.org/t/glium-post-mortem/7063).
  +
  Elegant and safe OpenGL wrapper.
  Glium is an intermediate layer between OpenGL and your application. You still need to manually handle
  