Update podspec to version 0.0.8
Update podspec to version 0.0.8

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