Add list of authors (taken from Git logs)

[ci skip]

AUTHORS

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+The Ruby REST Client would not be what it is today without the help of
+the following kind souls:
+
+Adam Jacob
+Adam Wiggins
+Aman Gupta
+Blake Mizerany
+Brad Ediger
+Braintree
+Brian Donovan
+Caleb Land
+Chris Dinn
+Chris Green
+Coda Hale
+Crawford
+Cyril Rohr
+Dan Mayer
+David Backeus
+Dmitri Dolguikh
+Dusty Doris
+Dylan Egan
+El Draper
+Evan Smith
+François Beausoleil
+Gabriele Cirulli
+Garry Shutler
+Giovanni Cappellotto
+Greg Borenstein
+Harm Aarts
+Hiro Asari
+Hugh McGowan
+Ian Warshak
+Ivan Makfinsky
+James Edward Gray II
+Jari Bakken
+Jeff Remer
+JH. Chabran
+John Barnette
+Jordi Massaguer Pla
+Juan Alvarez
+Julien Kirch
+Justin Coyne
+Keith Rarick
+Kenichi Kamiya
+Kevin Read
+Kyle VanderBeek
+Lars Gierth
+Lawrence Leonard Gilbert
+Lee Jarvis
+Lennon Day-Reynolds
+macournoyer
+Matthew Manning
+Michael Klett
+Mike Fletcher
+Nicholas Wieland
+Nick Plante
+Niko Dittmann
+Oscar Del Ben
+Paul Dlug
+Pedro Belo
+rafael.ssouza
+Rick "technoweenie"
+Robert Eanes
+Rodrigo Panachi
+Syl Turner
+T. Watanabe
+Tekin
+tpresa
+W. Andrew Loe III