Update Vim integration instructions
Update Vim integration instructions

aidancully/rust,aidancully/rust,studoot/rustfmt,SingingTree/rustfmt,graydon/rust,aidancully/rust,aidancully/rust,rust-lang/rustfmt,graydon/rust,graydon/rust,studoot/rustfmt,graydon/rust,SingingTree/rustfmt,aidancully/rust,graydon/rust,graydon/rust,rust-lang/rustfmt,Emilgardis/rustfmt,Emilgardis/rustfmt,aidancully/rust