Bump version for release 0.8.4
Bump version for release 0.8.4

ianyh/Amethyst,m4rw3r/Amethyst,olsonpm/Amethyst,ianyh/Amethyst,ianyh/Amethyst,hooplaaa/Amethyst,hooplaaa/Amethyst,cevaris/Amethyst,ianyh/Amethyst,egabancho/Amethyst,m4rw3r/Amethyst,olsonpm/Amethyst,cevaris/Amethyst,egabancho/Amethyst,ianyh/Amethyst