Release 0.8.0

New features:

• Support for retrieving reverse PTRs.
• Support for subnet-ranges.
• Add logging (#14).

Fixes:

• Hide internal methods from the public API.
• Fix Python 3 compatibility.
• Fix for creating admin accounts with Hetzner's new login site.
• Fix __repr__/__str__ issue with some exceptions (#23).
• Fix login for RobotWebInterface

Changes for the hetznerctl utility:

• show: Show subnets
• show: Show reverse PTRs
• New rdns subcommand for getting/setting/removing reverse-PTRs.
• Use argparse instead of optparse.
• Add command for managing admin accounts.
• New --debug flag for printing debugging information.