v4.5

What's Changed

• Handles non-existing preview_url attribute in submissions by @dbosk in #195
• Makes user matching case insensitive by @dbosk in #194
• clean up messages by @dbosk in #197
• Converts PDFs to text using pdf2txt by @dbosk in #198
• Bump argcomplete from 3.5.1 to 3.5.2 by @dependabot in #196

Full Changelog: v4.4...v4.5