Improve output of book.log
Improve output of book.log

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