Canvaslms

Bugfix in the grades module (`pf_grades` -> `grades`)

**Full Changelog**: https://github.com/dbosk/canvaslms/compare/v2.20...v2.21

What's Changed
* Bump argcomplete from 2.1.2 to 3.1.1 by dependabot in https://github.com/dbosk/canvaslms/pull/102
* Bump rich from 13.5.1 to 13.5.2 by dependabot in https://github.com/dbosk/canvaslms/pull/103
* Various improvements by dbosk:
- grades: Handle that a submission resource doesn't exist
- Skip reporting if there's no grade or date
- Improves the grades example
- disjunctmax: treats nonexisting as an F
- maxgradesurvey: treats missing submission as F
- Improves date handling in conjunctavgsurvey

**Full Changelog**: https://github.com/dbosk/canvaslms/compare/v2.19...v2.20

What's Changed
* Bump cryptography from 41.0.2 to 41.0.3 by dependabot in https://github.com/dbosk/canvaslms/pull/101
* Bugfix: didn't take into account students who did nothing by dbosk
* Bugfix: Can't print <login_id> for users without by dbosk

**Full Changelog**: https://github.com/dbosk/canvaslms/compare/v2.18...v2.19

What's Changed
* Bump rich from 13.0.0 to 13.4.2 by dependabot in https://github.com/dbosk/canvaslms/pull/91
* Fix users bug in results command by dbosk in https://github.com/dbosk/canvaslms/pull/99
* Updates versions of depends due to security by dbosk (thanks dependabot!)
in https://github.com/dbosk/canvaslms/pull/100


**Full Changelog**: https://github.com/dbosk/canvaslms/compare/v2.17...v2.18

What's Changed
* Let `results` command filter by user by dbosk in https://github.com/dbosk/canvaslms/pull/90


**Full Changelog**: https://github.com/dbosk/canvaslms/compare/v2.16...v2.17

Improves the help section of the `results` command and the documentation of the
`canvaslms.grades` module.

**Full Changelog**: https://github.com/dbosk/canvaslms/compare/v2.15...v2.16