Add some text about updatable to swap and update
Add some text about updatable to swap and update

relates #64

eworm-de/yubikey-personalization,Yubico/yubikey-personalization-dpkg,Yubico/yubikey-personalization,eworm-de/yubikey-personalization,eworm-de/yubikey-personalization,Yubico/yubikey-personalization-dpkg,Yubico/yubikey-personalization-dpkg,Yubico/yubikey-personalization