bump version, update sdl2 version to 0.9.1
bump version, update sdl2 version to 0.9.1

Cobrand/rust-sdl2,andelf/rust-sdl2_gfx,Rust-SDL2/rust-sdl2,vadixidav/rust-sdl2,Rust-SDL2/rust-sdl2,Cobrand/rust-sdl2,Rust-SDL2/rust-sdl2,AngryLawyer/rust-sdl2,Cobrand/rust-sdl2