v0.2.1

Added

• DeveloperConfig — new developer: field in MetainfoConfig; generates
  <developer [id="..."]><name>...</name></developer> in metainfo XML
  (AppStream 1.0 / Flathub requirement)

Changed

• Screenshot URL pinning is now config-driven: replaceMetainfoScreenshots()
  rebuilds the entire <screenshots> block from metainfo.screenshots: config
  • repo_slug + ref, instead of regex-replacing /main/ in the existing file.
    Works correctly regardless of what ref the file currently contains.
• MetainfoGenerator.generate({ref}) bakes the correct ref into screenshot URLs
  at generation time; main is used as a fallback when no ref is provided.