CONTRIBUTORS: remove some duplicates

cde/CONTRIBUTORS

@@ -14,17 +14,14 @@ Adam Sampson <ats at offog.org>
 Alex Ivanov <gnidorah at ya.ru>
 alx <alx at fastestcode.org>
 Anthony Perkins <anthony at muzz.co.uk>
-chase <chase at localhost.com>
 Chase <nicetrynsa at protonmail.ch>
 Chris Wareham <chris at chriswareham.net>
 Cody Kotichas <ckotichas at csu.fullerton.edu>
-David Cantrell <david.l.cantrell at gmail.com>
 David Cantrell <dcantrell at redhat.com>
 David J.McBrayer <D9J0M.dev at gmail.com>
 Douglas Carmichael <dcarmich at dcarmichael.net>
 Douglas Mencken <dougmencken at gmail.com>
 Edmond Orignac <edmond.orignac at wanadoo.fr>
-Edmond ORIGNAC <Edmond.Orignac at wanadoo.fr>
 Eugene Doudine <dudinea at gmail.com>
 Frederic Koehler <f.koehler427 at gmail.com>
 Giacomo Comes <comes at naic.edu>
@@ -33,14 +30,12 @@ Isaac Dunham <ibid.ag at gmail.com>
 James Woodcock <james_woodcock at yahoo.co.uk>
 Jelle Hermsen <jelle at jellehermsen.nl>
 Johannes von Rotz <jr at vrtz.ch>
-Jon Trulson <allura at localhost>
 Jon Trulson <jon at radscan.com>
 Jose Rubio <joserubiovidales at gmail.com>
 Karsten Pedersen <kpedersen at hotmail.co.uk>
 Lev Kujawski <int21h at mailbox.org>
 Liang Chang <l-chang at users.sourceforge.net>
 Marc Balmer <marc at msys.ch>
-Marcin Cieslak <saper at saper.info>
 Marcin Cieślak <saper at saper.info>
 Matthew Howkins <mhowkins at users.sourceforge.net>
 Matthew R. Trower <dev at blackshard.net>
@@ -50,22 +45,13 @@ Nina Didenko <nina.didenko at gmail.com>
 OBATA Akio <obache at outlook.com>
 Pascal de Bruijn <pmjdebruijn at pcode.nl>
 Pascal Stumpf <Pascal.Stumpf at cubes.de>
-Peter Howkins <flibble at users.sf.net>
 Peter Howkins <flibble at users.sourceforge.net>
-Peter Howkins <peter at azmaria.(none)>
-Peter Howkins <peter at deb8>
-Peter Howkins <peter at debian.uk.nds.com>
-Peter Howkins <peter at vita2.home.marutan.net>
-Peter Howkins <peter at x-1204.(none)>
-Peter Howkins <peter at x1204.(none)>
-Peter Howkins <peter at xubuntu.uk.nds.com>
 Peter Tribble <peter.tribble at gmail.com>
 Robert Tomsick <robert at tomsick.net>
 Stuart Brady <sdb at zubnet.me.uk>
 Swift Griggs <swiftgriggs at gmail.com>
 tu83 <7u83 at mail.ru>
 Ulrich Wilkens <mail at uwilkens.de>
-Ulrich Wilkens <wilkens at prokyon.(none)>
 WHR <msl0000023508 at gmail.com>
 William Schaub <wschaub at genesi-tech.com>
 wmoxam <wes at wmoxam.com>