Sync Dockerhub Readme #7

Job	Run time
sync (jeboehm/mailserver-mta)	5s
sync (jeboehm/mailserver-mda)	3s
sync (jeboehm/mailserver-filter)	6s
sync (jeboehm/mailserver-virus)	3s
sync (jeboehm/mailserver-web)	4s
sync (jeboehm/mailserver-db)	7s
sync (jeboehm/mailserver-ssl)	6s
sync (jeboehm/mailserver-unbound)	4s
	38s

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