Removing v3 support from 2.1

[Nicholas Cole]

On Wed, Oct 15, 2014 at 3:43 PM, Werner Koch <wk at gnupg.org> wrote:
> On Sun, 12 Oct 2014 20:29, wk at gnupg.org said:
>
>> I removed all code pertaining to v3 keys and also forced using v4
>> signatures.  If you want to test this, please checkout the
>> "wk/test-master" branch.
>
> I plan to move that to master soon.  If you want to send a "Please
> consider not to do that" comment, you should hurry up.

There are still some V3 keys in real-world usage (I agree with the
list that this is something to discourage).  I suppose as long as 1.4
is available for migration or for emergency use, I'm +0 on this
change.