Hi there,
The GifAnimation library is used to render processing sketches into animated Gifs
I’m probably years too late to admit it, but I have no time to maintain the GifAnimation library anymore. Processing has shifted out of my daily focus quite a while ago - which was made very clear to me when I could not login to this forum and my old username was now “available” 
Anyone interested in contributing (e.g. bringing the 3.0 branch to master and publish it according to Processings “new” library standards), either with GitHub commit access or full project owner, please contact me here or in the issue https://github.com/extrapixel/gif-animation/issues/18
Thanks!