Add 3.5 to travis config
Add 3.5 to travis config

cupy/cupy,niboshi/chainer,niboshi/chainer,anaruse/chainer,chainer/chainer,t-abe/chainer,wkentaro/chainer,muupan/chainer,sinhrks/chainer,ktnyt/chainer,AlpacaDB/chainer,wkentaro/chainer,kiyukuta/chainer,chainer/chainer,t-abe/chainer,tkerola/chainer,truongdq/chainer,cupy/cupy,hvy/chainer,aonotas/chainer,cemoody/chainer,hvy/chainer,ktnyt/chainer,cupy/cupy,ronekko/chainer,chainer/chainer,truongdq/chainer,okuta/chainer,kikusu/chainer,keisuke-umezawa/chainer,pfnet/chainer,ysekky/chainer,jnishi/chainer,keisuke-umezawa/chainer,ktnyt/chainer,chainer/chainer,AlpacaDB/chainer,hvy/chainer,jnishi/chainer,cupy/cupy,sinhrks/chainer,keisuke-umezawa/chainer,niboshi/chainer,hvy/chainer,benob/chainer,okuta/chainer,kashif/chainer,rezoo/chainer,wkentaro/chainer,okuta/chainer,keisuke-umezawa/chainer,okuta/chainer,delta2323/chainer,jnishi/chainer,benob/chainer,jnishi/chainer,kikusu/chainer,muupan/chainer,wkentaro/chainer,ktnyt/chainer,niboshi/chainer