Update windows readme.rtf for beta
Update windows readme.rtf for beta

seeminglee/pyglet64,niklaskorz/pyglet,adamlwgriffiths/Pyglet,niklaskorz/pyglet,niklaskorz/pyglet,adamlwgriffiths/Pyglet,niklaskorz/pyglet,seeminglee/pyglet64,seeminglee/pyglet64,adamlwgriffiths/Pyglet,adamlwgriffiths/Pyglet