Added UNAME variable
Added UNAME variable

Closes https://github.com/andelf/rust-sdl2_mixer/issues/6

Rust-SDL2/rust-sdl2,crumblingstatue/rust-sdl2_mixer,Rust-SDL2/rust-sdl2,bvssvni/rust-sdl2_mixer,andelf/rust-sdl2_mixer,AngryLawyer/rust-sdl2,Cobrand/rust-sdl2,vadixidav/rust-sdl2,Rust-SDL2/rust-sdl2,Cobrand/rust-sdl2,Cobrand/rust-sdl2