net/ntopng: version jump by an order of magnitude

[Franco Fichtner]

Hi Guido,

> On 20. Sep 2018, at 9:02 AM, Guido Falsi <madpilot at FreeBSD.org> wrote:
> 
> Terribly sorry I did not catch the typo before committing!

No worries, was just wondering about it to point out that going
back to the proper date will not upgrade through package because
the version number is smaller again.

> BTW they are skipping odd numbers, so next version is likely to be 3.8.

Alright.  Thanks for the quick reply.  :)


Cheers,
Franco