fix API issue
fix API issue

FsUnity/Unity3d.FsPickler,wallymathieu/FsPickler,nessos/FsPickler,nessos/FsPickler,haraldsteinlechner/FsPickler,cloudRoutine/Unity3d.FsPickler,mbraceproject/FsPickler,cloudRoutine/Unity3d.FsPickler,FsUnity/Unity3d.FsPickler,wallymathieu/FsPickler,haraldsteinlechner/FsPickler