component/readline: remove outdated readline5.

7 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed Cloudooo.UnitTest-Master

00:05:58

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:52:28

passed SlapOS-Master.StandaloneDeploymentScriptTest-Debian.Buster

12:27:07

passed SlapOS.Eggs.UnitTest-Master.Python2

00:17:30

passed SlapOS.Eggs.UnitTest-Master.Python3

00:20:47

passed SlapOS.Theia.ResilienceTest-Master-ERP5

08:25:23

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

00:44:05