Remove AUTHORS file

Information can be found in cgit.

AUTHORS

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-Cowboy is available thanks to the work of:
-
-Loïc Hoguin
-Magnus Klaar
-Ali Sabil
-Anthony Ramine
-Adam Cammack
-Tom Burdick
-James Fish
-Paul Oliver
-Slava Yurin
-Vladimir Dronnikov
-YAMAMOTO Takashi
-Yurii Rashkovskii
-Andrew Majorov
-Eduardo Gurgel
-Egobrain
-Josh Toft
-Steven Gravell
-Andrew Thompson
-Hunter Morris
-Ivan Lisenkov
-Matthias Endler
-Seletskiy Stanislav
-Sina Samavati
-Tristan Sloughter
-0x00F6
-0xAX
-Adam Cammmack
-Adrian Roe
-Alexei Sholik
-Andre Graf
-Andrew Houghton
-Andrzej Sliwa
-Blake Gentry
-Bob Ippolito
-Boris Faure
-Cameron Bytheway
-Cristian Hancila
-Danielle Sucher
-Dave Peticolas
-David Kelly
-DeadZen
-Dmitry Groshev
-Drew
-Drew Varner
-Eiichi Tsukata
-Fred Hebert
-Hans Ulrich Niedermann
-Ivan Blinkov
-Jeremy Ong
-Jesper Louis Andersen
-Josh Allmann
-Josh Marchán
-José Valim
-Julian Squires
-Klaus Trainer
-Kuk-Hyun Lee
-Mathieu Lecarme
-Max Lapshin
-Michael Truog
-Michiel Hakvoort
-Nakai Ryosuke
-Ori Bar
-Pablo Vieytes
-Paulo Oliveira
-Peter Ericson
-RJ
-Radosław Szymczyszyn
-Richard Ramsden
-Roberto Ostinelli
-Sergey Prokhorov
-Sergey Rublev
-Sergey Urbanovich
-Seven Du
-Thomas Nordström
-Tim Dysinger
-Tomas Morstein
-Unix1
-alisdair sullivan
-dbmercer
-derdesign
-pmyarchon
-rambocoder
-serge