Let --dump-default-config default to stdout #2579 (#2586)
Let --dump-default-config default to stdout #2579 (#2586)


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