Update to latest Rust
Update to latest Rust

bvssvni/event_loop,axelmagn/piston,placrosse/piston,caldwell/piston,bvssvni/piston,KevinFrans3/piston,getynge/piston,tempbottle/piston,PistonDevelopers/event_loop,Potpourri/piston,PistonDevelopers/piston,bvssvni/piston,oldmanmike/piston,mitchmindtree/piston,PistonDevelopers/piston