update isatty to remove 3 dependencies
update isatty to remove 3 dependencies

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