Fix installation instructions to use rustup
Fix installation instructions to use rustup
SingingTree/rustfmt,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,rust-lang/rustfmt,rust-lang/rustfmt,graydon/rust,SingingTree/rustfmt,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust