What's Changed
* Handles non-existing `preview_url` attribute in submissions by dbosk in https://github.com/dbosk/canvaslms/pull/195
* Makes user matching case insensitive by dbosk in https://github.com/dbosk/canvaslms/pull/194
* clean up messages by dbosk in https://github.com/dbosk/canvaslms/pull/197
* Converts PDFs to text using pdf2txt by dbosk in https://github.com/dbosk/canvaslms/pull/198
* Bump argcomplete from 3.5.1 to 3.5.2 by dependabot in https://github.com/dbosk/canvaslms/pull/196
**Full Changelog**: https://github.com/dbosk/canvaslms/compare/v4.4...v4.5