Update README: hardware accel is available now...

...at least with enable_kvm yes. Issue linked in the note was closed accordingly. So I think the old note was outdated as of fe19c91

README.md

@@ -118,11 +118,10 @@ With the following inputs:
 ```yaml
 - uses: cachix/install-nix-action@vXX
   with:
+    enable_kvm: true
     extra_nix_config: "system-features = nixos-test benchmark big-parallel kvm"
 ```
 
-[Note that there's no hardware acceleration on GitHub Actions.](https://github.com/actions/virtual-environments/issues/183#issuecomment-610723516).
-
 ### How do I install packages via nix-env from the specified `nix_path`?
 
 ```