Merge #1058

1058: Update README to mention rootless Docker. r=Emilgardis a=Alexhuszagh



Co-authored-by: Alex Huszagh <[email protected]>

Author: bors[bot]

README.md

@@ -48,10 +48,10 @@ for detailed installation instructions.
 One of these container engines is required. If both are installed, `cross` will
 default to `docker`.
 
-- [Docker]. Note that on Linux non-sudo users need to be in the `docker` group.
-  Read the official [post-installation steps][post]. Requires version 20.10 (API 1.40) or later.
+- [Docker]. Note that on Linux non-sudo users need to be in the `docker` group or use rootless docker.
+  Read the container engine [install guide][install] for the required installation and post-installation steps. Requires version 20.10 (API 1.40) or later.
 
-[post]: https://docs.docker.com/install/linux/linux-postinstall/
+[install]: https://github.com/cross-rs/cross/wiki/Getting-Started#installing-a-container-engine
 
 - [Podman]. Requires version 3.4.0 or later.