Button Bullet not well optimized

According to pagespeed insight the bullet.png little image is not well optimized. I give you the optimized one. It a small detail but it counts! Screenshot from pagespeed insight: https://dl.dropboxusercontent.com/u/7588358/JomSom/Bullet%20button%20not%20well%20compressed.png Well optimized bullet.png here: https://dl.dropboxusercontent.com/u/7588358/JomSom/bullet.png