message: docs: mention updating rust for manual build
diff: @@ -53,9 +53,12 @@ Note that binaries are built on the stable version of Rust, and I mainly test an
  ### Manual
  -There are a few ways to go about doing this. For example:
  +There are a few ways to go about doing this (note you will need the current version of stable Rust). For example:
  ```bash
  +# Update Rust on the stable channel
  +rustup update stable
  +
  # Clone and install the newest master version all via Cargo
  cargo install --git https://github.com/ClementTsang/bottom
  