Require ostree 2016.7 to get fix for issue #144
Require ostree 2016.7 to get fix for issue #144

The new ostree has a fix for delta updates that lets us
re-enable these for updates via the system helper.

amigadave/flatpak,handsome-feng/flatpak,GeorgesStavracas/flatpak,GeorgesStavracas/flatpak,handsome-feng/flatpak,amigadave/flatpak,handsome-feng/flatpak,handsome-feng/flatpak,flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,GeorgesStavracas/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,flatpak/flatpak,GeorgesStavracas/flatpak,GeorgesStavracas/flatpak,matthiasclasen/flatpak,amigadave/flatpak,handsome-feng/flatpak,amigadave/flatpak