Warning about setting mode should be updated

[kwinz]

If I use ykpersonalize -m 1 I am getting a warning: WARNING: Changing mode will require you to use another tool (ykneomgr or u2f-host) to switch back if OTP mode is disabled, really commit?

I did not find those tools on my offline machine so I started looking up documentation about this warning and I found that ykneomgr is depricated in favor of ykman. I already had ykman installed so it was fine.

Could you please update the warning with the new tool names?

[nevun]

this was fixed Aug 13th 2019 in https://github.com/Yubico/yubikey-personalization/commit/ff0806e621b7602e874aa6ba1d38369045225414