Merge pull request cupy#1853 from asi1024/release-v6.0.0b1

Bump version in Dockerfile

Merge pull request cupy#1852 from kmaehashi/release-v5.1.0-docker

Bump version in Dockerfile for v5.1.0

Merge pull request cupy#1747 from kmaehashi/release-v6.0.0a1-docker

Bump version in Dockerfile

Merge pull request cupy#1749 from beam2d/intersphinx-v5

Update intersphinx mapping of Chainer to stable

Merge pull request cupy#1664 from asi1024/v5.0.0rc1

Update version to v5.0.0rc1 in Dockerfiles

Merge pull request cupy#1663 from mitmul/update-v4.5.0

Update v4.5.0

Merge pull request cupy#1600 from kmaehashi/bump-version-v4.4.1

[hotfix] bump version for v4.4.1

Merge pull request cupy#1563 from niboshi/update-dockerfiles

Update version in Dockerfiles

Merge pull request cupy#1564 from mitmul/release-v4.4.0

Update version numbers in Dockerfiles

Merge pull request cupy#1470 from niboshi/release-v5.0.0b3

Update to v5.0.0b3