message: add comment about wasi on windows
diff: @@ -5,7 +5,7 @@ In this example we extend the imports of Wasmer's WASI ABI to demonstrate how cu
  See the `wasmer/examples/plugin.rs` file for the source code of the host system.
  ## Compiling
  -
  +_Attention Windows users: WASI target only works with the `nightly-x86_64-pc-windows-gnu` toolchain._
  ```
  # Install an up to date version of Rust nightly
  # Add the target
  