changelog for 1.2.0
changelog for 1.2.0

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