Add a proper way to set "error" class to <input> element inside <v-suggest>

[tikvarova]

Dear Terry,

Could you please provide a simple way to "Add/Remove" class "error" and "valid" (maybe via props) to a nested tag.

This will be very helpful if we use VUELIDATE for example to dynamically set remove visual representation of errors (missed selection for example) to a end user.

Thanks in advance