Update CHANGELOG for 1.4.2
Update CHANGELOG for 1.4.2

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