Bump version to 0.9.5b4
Bump version to 0.9.5b4

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