Support Bevy 0.11

[VitalyAnkh]

Bevy 0.11 is out! Could bevy_iced update to bevy 0.11?

[tasgon]

There's already a PR up for that, #16. I'll review that soon, but I can't publish it to crates.io anyway until iced updates their crate to use the same wgpu as bevy.

[jsatka]

I just opened #18 in which iced dependencies are specified as (as of writing, the most recent commit of) the git repo master branch. Those dependency specs should be updated to the crates.io release version once iced 0.10 is released.

But the PR's version of bevy_iced can already be used in the meantime with bevy 0.11, if need be:

[dependencies]
bevy = "0.11"
bevy_iced = { git = "https://github.com/jsatka/bevy_iced", rev = "5a30923" }