v2.1.0

What's Changed

• Add support for Python 3.15 by @hugovk in #74
• Drop support for Python 3.9 by @hugovk in #68
• Keep sections in importance order by @hugovk in #75
• Add the -i / --issue option to the 'blurb add' command.
  This lets you pre-fill the gh-issue field in the template.
• Add the -s / --section option to the 'blurb add' command.
  This lets you pre-fill the section field in the template.
• Use argparse for the CLI by @hugovk in #83
• Fix a typo in the new entry template by @StanFromIreland in #84