Follow rust: Suffix `us` is replaced by `usize`
Follow rust: Suffix `us` is replaced by `usize`

Byron/serde,oli-obk/rust-serde,sidred10/serde,pcwalton/serde,infinityb/serde,jmesmon/serde,erickt/serde,tempbottle/serde,JohnHeitmann/serde,skade/serde,serde-rs/serde,Hoverbear/serde,csmulhern/serde,Ticki/serde,thorbenk/serde,eefriedman/serde,3Hren/serde