Update chainer/_version.py
Update chainer/_version.py

Co-Authored-By: Kenichi Maehashi <50f3f01caa053693ce619d596e14b0ff3901ab49@kenichimaehashi.com>
hvy/chainer,chainer/chainer,pfnet/chainer,hvy/chainer,hvy/chainer,hvy/chainer,chainer/chainer,chainer/chainer,chainer/chainer