Release v0.4.0

• Add file_exists()
• Add get_file_versions()
• Fix bug in path_to_file_href() that occurred when a user name contained
  spaces. Document and export this function.
• download_files(): Add argument dbg
• get_version_info(): Add argument dbg
• Deprecate list_file_versions()

Release v0.1.0

First release of kwb.nextcloud with functions:

• create_folder()
• delete_file_or_folder(), TAKE CARE!
• download_files()
• get_version_info()
• list_files()
• upload_file()