[Vobject] difference between handling of 2.1 and 3.0

[Jeffrey Harris]

Hi Jonathan,

> Should a VCard2_1 behavior exist, or is it the case that the VCard3_0
> behavior handles all previous vcard versions to 3.0?

It would be great for someone to write a VCard2_1 behavior;
serialization is significantly different for 2.1, though, I've never
gotten around to writing one.

Sincerely,
Jeffrey