0.2.0

• Adds new list-directory command to list content of EOS directories
  holding open data files.
• Adds support for Python 3.9.
• Improves download-files command to allow using XRootD protocol.
• Improves download-files command to allow using HTTPS protocol.
• Improves download-files command to optionally verify file integrity as
  soon as files are being downloaded.
• Improves get-file-locations command to optionally output file sizes and
  checksums.
• Improves output format colouring to better indicate notes and errors.
• Fixes minor issues and improves code coverage.