Merge pull request #226 from django-daiquiri/hotfix-datalink-doi #424

Job	Run time
build (mysql, 3.9)	4m 54s
build (mysql, 3.11)	5m 27s
build (postgres, 3.9)	5m 15s
build (postgres, 3.11)	5m 8s
Indicate completion to coveralls	15s
	20m 59s

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