New maintainers for prometheus/client_golang

[Bjoern Rabenstein]

Hi Prometheans,

I'm retiring as a maintainer of prometheus/client_golang, focusing on
other projects within the Prometheus ecosystem (like, who would have
guessed, the new histograms...).

Please welcome the new maintainers:
* Bartłomiej Płotka <bwpl...@gmail.com> @bwplotka
* Kemal Akkoyun <kakk...@gmail.com> @kakkoyun

If you want to see the two in action talking about client_golang,
click here: https://www.youtube.com/watch?v=LU6D5cNeHks

Cheers.
--
Björn Rabenstein
[PGP-ID] 0x851C3DA17D748D03
[email] bjo...@rabenste.in