#!/usr/bin/env php
Usage:
 <command> [<version>]

Commands:
    release:            Release the given version (requires second argument)
    to-next-dev:        Update to the next version following the current version
    to-stable:          Mark the current version as stable
    to-next-patch-dev:  Update to the next patch development version
    to-next-minor-dev:  Update to the next minor development version
    to-next-major-dev:  Update to the next major development version
    get-version:        Print the current version number