Merge pull request #1337 from fatfreecrm/master

Prep 0.22.1

Centralise detection of previous route (#1222)

* Remove unused previous

* Centralise previous object detection. Remove falling back to a number if not found

* Apply suggestions from code review

Fix version

Bump version to 0.20.1

0.20.0

Merge pull request #920 from fatfreecrm/security-update-0.19

CVE-2021-22885

Update changelog

Prep release

Update changelog

Version 0.18.1