Remove AUTHORS metadata

This file hasn't been kept up to date, and it's easy to get the
data from GitHub.

AUTHORS.txt

@@ -1,44 +0,0 @@
-Chrono is mainly written by Kang Seonghoon <public+rust@mearie.org>,
-and also the following people (in ascending order):
-
-Alex Mikhalev <alexmikhalevalex@gmail.com>
-Alexander Bulaev <alexbool@yandex-team.ru>
-Ashley Mannix <ashleymannix@live.com.au>
-Ben Boeckel <mathstuf@gmail.com>
-Ben Eills <ben@beneills.com>
-Brandon W Maister <bwm@knewton.com>
-Brandon W Maister <quodlibetor@gmail.com>
-Cecile Tonglet <cecile.tonglet@cecton.com>
-Colin Ray <r.colinray@gmail.com>
-Corey Farwell <coreyf@rwell.org>
-Dan <dan@ebip.co.uk>
-Danilo Bargen <mail@dbrgn.ch>
-David Hewson <dev@daveid.co.uk>
-David Ross <daboross@daboross.net>
-David Tolnay <dtolnay@gmail.com>
-David Willie <david.willie.1@gmail.com>
-Eric Findlay <e.findlay@protonmail.ch>
-Eunchong Yu <kroisse@gmail.com>
-Frans Skarman <frans.skarman@gmail.com>
-Huon Wilson <dbau.pp+github@gmail.com>
-Igor Gnatenko <ignatenko@redhat.com>
-Jake Vossen <jake@vossen.dev>
-Jim Turner <jturner314@gmail.com>
-Jisoo Park <xxxyel@gmail.com>
-Joe Wilm <joe@jwilm.com>
-John Heitmann <jheitmann@gmail.com>
-John Nagle <nagle@sitetruth.com>
-Jonas mg <jonasmg@yepmail.net>
-János Illés <ijanos@gmail.com>
-Ken Tossell <ken@tossell.net>
-Kurtis Nusbaum <kcommiter@gmail.com>
-Martin Risell Lilja <martin.risell.lilja@gmail.com>
-Richard Petrie <rap1011@ksu.edu>
-Ryan Lewis <ryansname@gmail.com>
-Sergey V. Shadoy <shadoysv@yandex.ru>
-Sergey V. Galtsev <sergey.v.galtsev@github.com>
-Steve Klabnik <steve@steveklabnik.com>
-Tom Gallacher <tomgallacher23@gmail.com>
-klutzy <klutzytheklutzy@gmail.com>
-kud1ing <github@kudling.de>
-Yohan Boogaert <yozhgoor@outlook.com>