Reverting project version
Reverting project version

Reverting project version back to 2018.3.9f1.

killerantz/HoloToolkit-Unity,vladkol/MixedRealityToolkit-Unity,DDReaper/MixedRealityToolkit-Unity,vladkol/MixedRealityToolkit-Unity,killerantz/HoloToolkit-Unity,vladkol/MixedRealityToolkit-Unity,killerantz/HoloToolkit-Unity,killerantz/HoloToolkit-Unity