DOC: update SILL-2020 tag

Refs: #774
4 jobs for 774_sill in 3 minutes and 43 seconds (queued for 9 seconds)
Status Job ID Name Coverage
  Test
passed #30942
composer_validate

00:00:58

passed #30943
php-lint

00:00:52

passed #30944
phpcs

00:00:51

passed #30945
phpunit

00:03:35

38.48%