revert npm main field (fix SSR externalization)
revert npm main field (fix SSR externalization)

hanhongyuan/vue,xueyaodeai/vue,pramudaprakash/GITHUB,vuejs/vue,Kingwl/vue,lizhiyao/vue,lizhiyao/vue,Ddder-FE/vue,xueyaodeai/vue,vuejs/vue,Jinjiang/vue,pramudaprakash/GITHUB,greennyreborn/vue,KingMario/vue,sreesirisha/GITMidtermexam,lizhiyao/vue,xueyaodeai/vue,optimizely/vue,Hanks10100/vue,hanhongyuan/vue,posva/vue,hanhongyuan/vue,Hanks10100/vue,sreesirisha/GITMidtermexam,wushuyi/vue,Ddder-FE/vue,greennyreborn/vue,Kingwl/vue,KingMario/vue,Ddder-FE/vue,posva/vue,leemotive/vue,gebilaoxiong/vue,leemotive/vue,gebilaoxiong/vue,Hanks10100/vue,Kingwl/vue,posva/vue,pramudaprakash/GITHUB,Jinjiang/vue,Kingwl/vue,KingMario/vue,Ddder-FE/vue,greennyreborn/vue,cnchanning/vue,sreesirisha/GITMidtermexam,Jinjiang/vue,cnchanning/vue,KingMario/vue,pramudaprakash/GITHUB,sreesirisha/GITMidtermexam,xueyaodeai/vue,gebilaoxiong/vue,cnchanning/vue,leemotive/vue,vuejs/vue,wushuyi/vue,posva/vue,lizhiyao/vue,vuejs/vue,leemotive/vue,greennyreborn/vue,Jinjiang/vue,Hanks10100/vue,hanhongyuan/vue