docs[README.md]: Update command to check fail2ban-client version

Changed line 72 from "fail2ban-client version" to "fail2ban-client --version", so it shows the right command.
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Gabs 2026-01-10 18:32:41 -03:00 committed by GitHub
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@ -69,7 +69,7 @@ to see if everything is alright. You should always use fail2ban-client and
never call fail2ban-server directly.
You can verify that you have the correct version installed with
fail2ban-client version
fail2ban-client --version
Please note that the system init/service script is not automatically installed.
To enable fail2ban as an automatic service, simply copy the script for your