Recommend UACCESS tag instead of plugdev group

[lnqs]

The plugdev group suggested to use for the device files is specific to Debian based Linux distributions and doesn't exist on a lot of others. To keep the system setup consistent the UACCESS tag is recommended now.

Some issues of other projects facing this for reference:

https://bugzilla.redhat.com/show_bug.cgi?id=1571599 https://bugs.archlinux.org/task/68533 https://github.com/OpenHantek/openhantek/issues/80 https://github.com/Yubico/libu2f-host/issues/116