[ipv6-wg] Resignation as co-chair of ipv6

Hi David,

> My personal circumstances have changed in such a way that I 
> most recently did not spent as much time and effort for the ipv6
> working group as it deserves. At the same time, I have served the
> working group for over 15 years and it would certainly not be unreasonable
> to think that it is good for the working group to change direction.
> 
> Considering the above, I have decided to resign as co-chair of the ipv6
> working group. I hope that this change will give a chance to a new
> generation of RIPE participants to play a role as a chairperson of a working
> group and as a participant in the RIPE working group chair collective.

Thank you for all the good work you have done for RIPE and the IPv6 WG.
Sander