updated changes and credits
bumped version
fixup credits

The previous commit replaced tcpdump CREDITS with libpcap CREDITS and
listed new contributors on top of that. Restore the previous contents
and re-add:

* Bram
* Dmitrij Tejblum
* fra
* Gregory Detal
* Jorge Boncompte [DTI2]
* Longinus00
* Marc Abramowitz
* Ola Martin Lykkja
* Oleksij Rempel
* Petar Alilovic
* Stephane Bortzmeyer
* Thomas Jacob
* Udayakumar
* Wim Torfs