message: Update README.md
  Useless use of cat
diff: @@ -54,7 +54,7 @@ will walk you through how to build from source on both macOS and Ubuntu.
  If you run into problems, you can try a known-good version of the compiler by running
  ```sh
  - rustup override set $(cat rustc-version)
  + rustup override set $(<rustc-version)
  ```
  #### Additional Linux Prerequisites
  