readme: add note about `standard`
readme: add note about `standard`

LinusU/buffer,feross/buffer,btd/buffer,nolanlawson/buffer,btd/buffer,SAGV/buffer,kawanet/buffer,feross/buffer,LiuDeng/buffer,kawanet/buffer,beni55/buffer,SAGV/buffer,loon3/buffer,nolanlawson/buffer,LiuDeng/buffer,beni55/buffer,feross/buffer,LinusU/buffer,loon3/buffer