Merge pull request bannzai#45 from kishikawakatsumi/release_063

Bump version to 0.6.3

Merge pull request bannzai#25 from kishikawakatsumi/release_062

Bump version to 0.6.2

Merge pull request bannzai#10 from kishikawakatsumi/release061

Bump version to v0.6.1

Initial commit