Update changelog
Update changelog

dwrensha/mio,fuchsia-mirror/third_party-mio,asomers/mio,asomers/mio,arthurprs/mio,fuchsia-mirror/third_party-mio,murarth/mio,rrichardson/mio,carllerche/mio,carllerche/mio,danburkert/mio,mneumann/mio,mneumann/mio