Update CHANGELOG.md to reflect the promotion of 3.3.20
Update CHANGELOG.md to reflect the promotion of 3.3.20

Obvious fix; these changes are the result of automation not creative thinking.

chef/supermarket,robbkidd/supermarket,chef/supermarket,chef/supermarket,chef/supermarket,robbkidd/supermarket,robbkidd/supermarket,chef/supermarket,robbkidd/supermarket