add link to Adam
add link to Adam

pfnet/chainer,okuta/chainer,keisuke-umezawa/chainer,okuta/chainer,wkentaro/chainer,wkentaro/chainer,okuta/chainer,hvy/chainer,hvy/chainer,chainer/chainer,niboshi/chainer,niboshi/chainer,chainer/chainer,chainer/chainer,hvy/chainer,wkentaro/chainer,keisuke-umezawa/chainer,niboshi/chainer,tkerola/chainer,hvy/chainer,niboshi/chainer,wkentaro/chainer,okuta/chainer,chainer/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer