all: update license information

AUTHORS

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+# This is the official list of go-ethereum authors for copyright purposes.
+
+Alex Leverington <alex@ethdev.com>
+Alexandre Van de Sande <alex.vandesande@ethdev.com>
+Bas van Kervel <bas@ethdev.com>
+Daniel A. Nagy <nagy.da@gmail.com>
+Ethan Buchman <ethan@coinculture.info>
+Fabian Vogelsteller <fabian@frozeman.de>
+Felix Lange <fjl@twurst.com>
+Gustav Simonsson <gustav.simonsson@gmail.com>
+Jae Kwon <jkwon.work@gmail.com>
+Jason Carver <jacarver@linkedin.com>
+Jeffrey Wilcke <jeffrey@ethereum.org>
+Joseph Chow <ethereum@outlook.com>
+Kobi Gurkan <kobigurk@gmail.com>
+Maran Hidskes <maran.hidskes@gmail.com>
+Marek Kotewicz <marek.kotewicz@gmail.com>
+Matthew Wampler-Doty <matthew.wampler.doty@gmail.com>
+Nick Dodson <silentcicero@outlook.com>
+Péter Szilágyi <peterke@gmail.com>
+Taylor Gerring <taylor.gerring@gmail.com>
+Viktor Trón <viktor.tron@gmail.com>
+Vitalik Buterin <v@buterin.com>
+Zsolt Felföldi <zsfelfoldi@gmail.com>