0.1.0

Added

• manage command, with management subcommands.
• manage content, which lists the content for the specified version.
• manage check, which checks the versioned files are parsable.
• manage ugprade, which performs the specified semantic version upgrade across the specified versioned files.
• unreleased command, with unreleased subcommands.
• unreleased content, which lists the unreleased content.
• unreleased add, which allows inline or prompted adding of unreleased changes.