Update Pistoncore-Window Version
Update Pistoncore-Window Version

It was causing problems in building of conrod examples because the WindowSettings struct didn't match up.
placrosse/piston,caldwell/piston,tempbottle/piston,mitchmindtree/piston,axelmagn/piston,Potpourri/piston,bvssvni/piston,KevinFrans3/piston,bvssvni/piston,PistonDevelopers/piston,oldmanmike/piston,PistonDevelopers/piston,getynge/piston