Update fs-extra to fix fs.copy issue
Update fs-extra to fix fs.copy issue

sunlianghua/gitbook,youprofit/gitbook,CN-Sean/gitbook,webwlsong/gitbook,gdbooks/gitbook,JohnTroony/gitbook,xxxhycl2010/gitbook,tshoper/gitbook,hujianfei1989/gitbook,athiruban/gitbook,a-moses/gitbook,nycitt/gitbook,haamop/documentation,gencer/gitbook,rohan07/gitbook,ferrior30/gitbook,grokcoder/gitbook,hujianfei1989/gitbook,shibe97/gitbook,a-moses/gitbook,npracht/documentation,iamchenxin/gitbook,FKV587/gitbook,sunlianghua/gitbook,ZachLamb/gitbook,alex-dixon/gitbook,ZachLamb/gitbook,qingying5810/gitbook,gencer/gitbook,boyXiong/gitbook,intfrr/gitbook,npracht/documentation,alex-dixon/gitbook,haamop/documentation,minghe/gitbook,xcv58/gitbook,intfrr/gitbook,GitbookIO/gitbook,OriPekelman/gitbook,tshoper/gitbook,xxxhycl2010/gitbook,palerdot/gitbook,gaearon/gitbook,rohan07/gitbook,sudobashme/gitbook,mruse/gitbook,iflyup/gitbook,xcv58/gitbook,justinleoye/gitbook,wewelove/gitbook,grokcoder/gitbook,escopecz/documentation,snowsnail/gitbook,nycitt/gitbook,shibe97/gitbook,boyXiong/gitbook,athiruban/gitbook,hongbinz/gitbook,thelastmile/gitbook,vehar/gitbook,ryanswanson/gitbook,iamchenxin/gitbook,switchspan/gitbook,guiquanz/gitbook,kamyu104/gitbook,lucciano/gitbook,wewelove/gitbook,justinleoye/gitbook,kamyu104/gitbook,switchspan/gitbook,jasonslyvia/gitbook,lucciano/gitbook,CN-Sean/gitbook,tzq668766/gitbook,youprofit/gitbook,jasonslyvia/gitbook,snowsnail/gitbook,gdbooks/gitbook,mruse/gitbook,mautic/documentation,webwlsong/gitbook,minghe/gitbook,vehar/gitbook,strawluffy/gitbook,OriPekelman/gitbook,tzq668766/gitbook,megumiteam/documentation,iflyup/gitbook,ferrior30/gitbook,FKV587/gitbook,2390183798/gitbook,bradparks/gitbook,megumiteam/documentation,qingying5810/gitbook,escopecz/documentation,jocr1627/gitbook,palerdot/gitbook,hongbinz/gitbook,gaearon/gitbook,thelastmile/gitbook,bradparks/gitbook,sudobashme/gitbook,guiquanz/gitbook,2390183798/gitbook,jocr1627/gitbook,mautic/documentation,JohnTroony/gitbook