message: Update VM's Testing docs
diff: @@ -43,9 +43,13 @@ docker run --rm -v "$(pwd)":/code \
  ## Testing
  +By default, this repository is built and tested with the singlepass backend.
  +You can enable the `cranelift` feature to override the default backend with Cranelift
  +
  ```sh
  cd packages/vm
  cargo test --features iterator
  +cargo test --features cranelift,iterator
  ```
  ## License
  