npm version --help
# npm version [<newversion> | major | minor | patch | premajor | preminor | prepatch | prerelease | from-git]

npm version major  # v1.0.0 => v2.0.0
npm version minor  # v1.0.0 => v1.1.0
npm version patch  # v1.0.0 => v1.0.1