Update tinyformat to fix gcc 4.8 compilation issue
Update tinyformat to fix gcc 4.8 compilation issue

cwilling/oiio,sambler/oiio,bdeluca/oiio,mcanthony/oiio,sambler/oiio,mcanthony/oiio,bdeluca/oiio,bdeluca/oiio,OpenImageIO/oiio,scott-wilson/oiio,lgritz/oiio,sambler/oiio,micler/oiio,lgritz/oiio,bdeluca/oiio,sambler/oiio,micler/oiio,YangYangTL/oiio,OpenImageIO/oiio,scott-wilson/oiio,OpenImageIO/oiio,micler/oiio,micler/oiio,cwilling/oiio,YangYangTL/oiio,OpenImageIO/oiio,YangYangTL/oiio,cwilling/oiio,mcanthony/oiio,YangYangTL/oiio,scott-wilson/oiio,mcanthony/oiio,cwilling/oiio,scott-wilson/oiio,lgritz/oiio,lgritz/oiio