fix typo:  rust-toolchain, not rust*up*-toolchain
fix typo:  rust-toolchain, not rust*up*-toolchain
nodakai/rustup.rs,nodakai/rustup.rs,rust-lang/rustup,rust-lang/rustup,nodakai/rustup.rs,rust-lang/rustup,rust-lang/rustup,nodakai/rustup.rs,rust-lang/rustup,nodakai/rustup.rs