DGActivityIndicatorThreeDotsAnimation Animation is wrong

[AlbertRenshaw]

The animation for DGActivityIndicatorThreeDotsAnimation is not staggered like in the gif preview. All dots grow and shrink at the same time instead of staggering the way the gif on this repository shows. The solution can be made in DGActivityIndicatorThreeDotsAnimation.m

Change: animation.beginTime = beginTime;

To: animation.beginTime = beginTime+((0.5f/3.0f)*(float)i);