Release 0.9.9

Major changes in 0.9.9

flatpak-builder was split out from flatpak into its own module.

• Pass --die-with-parent to all flatpak build commands

$ shasum flatpak-builder-0.9.9.tar.xz 
44864c8036edaf29e62fc636a3a3b44740e13be0  flatpak-builder-0.9.9.tar.xz