Fix the number of the referenced issue
Fix the number of the referenced issue

hvy/chainer,rezoo/chainer,jnishi/chainer,anaruse/chainer,ronekko/chainer,keisuke-umezawa/chainer,niboshi/chainer,okuta/chainer,jnishi/chainer,pfnet/chainer,ktnyt/chainer,ktnyt/chainer,niboshi/chainer,niboshi/chainer,okuta/chainer,okuta/chainer,okuta/chainer,ktnyt/chainer,hvy/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,wkentaro/chainer,chainer/chainer,keisuke-umezawa/chainer,wkentaro/chainer,hvy/chainer,chainer/chainer,jnishi/chainer,niboshi/chainer,chainer/chainer,hvy/chainer,chainer/chainer,jnishi/chainer,wkentaro/chainer,tkerola/chainer,wkentaro/chainer,ktnyt/chainer