message: README.md: Rework requirements
diff: _libhermit-rs_ is the kernel of the [RustyHermit](https://github.com/hermitcore/rusty-hermit) unikernel project.
  +## Requirements
  +
  +* [`rustup`](https://www.rust-lang.org/tools/install)
  +* [NASM](https://nasm.us/) (only for SMP on x86_64)
  +
  ## Building the kernel
  Usually the kernel will be linked as static library to your applications.
  @@ -18,23 +23,11 @@ Usually the kernel will be linked as static library to your applications.
  ### Standalone static library build
  -If this does not fit your needs and you want to build the kernel as static library to link afterwards, you need the following:
  -
  -The Rust **nightly** toolchain ([official webpage](https://www.rust-lang.org/)), the source code of the Rust runtime, and llvm-tools:
  -
  -```sh
  -rustup toolchain install nightly
  -rustup component add rust-src llvm-tools-preview
  -```
  -
  -You can then build `libhermit-rs` with the following command
  -
  ```sh
  cargo xtask build --arch x86_64
  ```
  -The resulting library then can be found in `target/x86_64/debug/libhermit.a`
  -
  +On completion, the script will print the path of `libhermit.a`.
  ### Control the kernel messages verbosity
  