Merge #808

808: Update glium so that rayon-demo runs on Gnome Wayland r=cuviper a=mrksu

Currently, the `nbody` demo fails to open in the Gnome 3.38 Wayland session:

```
rayon-demo]$ cargo run --release -- nbody visualize

[wayland-client error] Attempted to dispatch unknown opcode 0 for wl_shm, aborting.
```

The problem has already been fixed in `glium` 0.28.0. After updating the crate version, the demo runs as expected.

Co-authored-by: Marek Suchánek <marek.suchanek@protonmail.com>
Co-authored-by: Josh Stone <cuviper@gmail.com>