docs: add unsafe_op_in_unsafe_fn note to README.md

Author: ErichDonGubler

CHANGELOG.md

@@ -117,6 +117,8 @@ SurfaceConfiguration {
 - Address Clippy 0.1.63 complaints. By @jimblandy in [#2977](https://github.com/gfx-rs/wgpu/pull/2977)
 - Don't use `PhantomData` for `IdentityManager`'s `Input` type. By @jimblandy in [#2972](https://github.com/gfx-rs/wgpu/pull/2972)
 - Changed Naga variant in ShaderSource to `Cow<'static, Module>`, to allow loading global variables by @daxpedda in [#2903](https://github.com/gfx-rs/wgpu/pull/2903)
+- Add `unsafe_op_in_unsafe_fn` to Clippy lints in the entire workspace. By
+    @ErichDonGubler in [#????](https://github.com/gfx-rs/wgpu/pull/????).
 
 #### Metal
 - Extract the generic code into `get_metal_layer` by @jinleili in [#2826](https://github.com/gfx-rs/wgpu/pull/2826)