2.7.0

Added

• Support for Python 3.12
• CI to run unit tests
• Tests for the CLI entry point

Changed

• Set the default chart name to a blank string in the CLI (fixes #9)
• Use shutil.get_terminal_size() instead of os.get_terminal_size() to be able to run tests without hitting OSError: [Errno 25] Inappropriate ioctl for device
• Fix Mypy error PEP 484 prohibits implicit Optional