Update podspec file
Update podspec file

zht415/DFImageManager,peterpaulis/DFImageManager,arvindhsukumar/DFImageManager,JeeLiu/DFImageManager,buithuyen/DFImageManager,peterpaulis/DFImageManager,holgersindbaek/DFImageManager,digal/DFImageManager,buithuyen/DFImageManager,mohsinalimat/DFImageManager,hzm0318hzm/DFImageManager,kean/DFImageManager,AddAloner/DFImageManager,AddAloner/DFImageManager,jsooriah/DFImageManager,mohsinalimat/DFImageManager,Adlai-Holler/DFImageManager,DABSquared/DFImageManager,ichu501/DFImageManager,vitkovsky/DFImageManager,digal/DFImageManager,zhaoguohui/DFImageManager,holgersindbaek/DFImageManager