README: document that rustup-installed Rust supports rust-toolchain.t…

…oml files by default
DeterminateSystems · Oct 12, 2022 · 595b956 · 595b956
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diff --git a/README.md b/README.md
@@ -31,6 +31,9 @@ To use Riff, you need to install these binaries on your system:
 * [`nix`][nix-install]
 * [`cargo`][rust-install]
 
+> **Note**: We recommend using `rustup` to install Rust, so that you will get
+> `rust-toolchain.toml` support by default.
+
 ## Installation
 
 ### Using Nix