message: remove outdated README comment
diff: @@ -45,8 +45,6 @@ Now you can run your project in miri:
  dependencies to be compiled the right way, that would not happen if they have
  previously already been compiled.
  2. To run all tests in your project through Miri, use `cargo +nightly miri test`.
  - **NOTE**: This is currently broken, see the discussion in
  - [#479](https://github.com/solson/miri/issues/479).
  3. If you have a binary project, you can run it through Miri using `cargo
  +nightly miri run`.
  