Update license with Apache 2.0 and AUTHORS file

AUTHORS.md

+This is a (possibly incomplete) list of all the contributors to python-dateutil,
+initially generated from the git author metadata. The details of their specific
+contributions can be found in the git history.
+
+Prior to 2017-12-01, the library was licensed solely under the BSD 3-clause
+license, all contributions on or after 2017-12-01 are dual-licensed between
+Apache 2.0 and BSD 3-clause. In the list below, anyone whose name is marked with
+**R** has agreed to re-license their previously submitted code under Apache 2.0.
+
+## Contributors (alphabetical order)
+
+- Adam Chainz <adam@MASKED>
+- Adrien Cossa <cossa@MASKED>
+- Alec Nikolas Reiter <alecreiter@MASKED>
+- Alec Reiter <areiter@MASKED>
+- Alex Verdyan <verdyan@MASKED>
+- Alex Willmer <alex@MASKED> (gh: @moreati)
+- Alexander Brugh <alexander.brugh@MASKED> (gh: @abrugh)
+- Andrew Murray <radarhere@MASKED>
+- Brandon W Maister <quodlibetor@MASKED>
+- Brock Mendel <jbrockmendel@MASKED> (gh: @jbrockmendel) **R**
+- Carlos <carlosxl@MASKED>
+- Christopher Corley <cscorley@MASKED>
+- Claudio Canepa <ccanepacc@MASKED>
+- Daniel Lepage <dplepage@MASKED>
+- David Lehrian <david@MASKED>
+- Dominik Kozaczko <dominik@MASKED>
+- Elvis Pranskevichus <el@MASKED>
+- Gabriel Poesia <gabriel.poesia@MASKED>
+- Gustavo Niemeyer <gustavo@niemeyer.net> (gh: @niemeyer)
+- Holger Joukl <holger.joukl@MASKED> (gh: @hjoukl)
+- Igor <mrigor83@MASKED>
+- Ionuț Ciocîrlan <jdxlark@MASKED>
+- Jan Studený <jendas1@MASKED>
+- Jitesh <jitesh@MASKED>
+- Jon Dufresne <jon.dufresne@MASKED> (gh: @jdufresne) **R**
+- Jonas Neubert <jonas@MASKED>
+- Kubilay Kocak <koobs@MASKED>
+- Mario Corchero <mcorcherojim@MASKED> (gh: @mariocj89) **R**
+- Matthew Schinckel <matt@MASKED>
+- Max Shenfield <shenfieldmax@MASKED>
+- Maxime Lorant <maxime.lorant@MASKED>
+- Michael Aquilina <michaelaquilina@MASKED> (gh: @MichaelAquilina)
+- Michael J. Schultz <mjschultz@MASKED>
+- Mike Gilbert <floppym@MASKED>
+- Nick Smith <nick.smith@MASKED>
+- Paul Ganssle <paul@ganssle.io> (gh: @pganssle) **R**
+- Pascal van Kooten <kootenpv@MASKED>
+- Pavel Ponomarev <comrad.awsum@MASKED>
+- Peter Bieringer <pb@MASKED>
+- Quentin Pradet <quentin@MASKED>
+- Roy Williams <rwilliams@MASKED>
+- Savraj <savraj@MASKED>
+- Sergey Vishnikin <armicron@MASKED>
+- Thierry Bastian <thierryb@MASKED>
+- Thomas A Caswell <tcaswell@MASKED> (gh: @tacaswell)
+- Thomas Achtemichuk <tom@MASKED>
+- Thomas Kluyver <takowl@MASKED> (gh: @takluyver)
+- Tomi Pieviläinen <tomi.pievilainen@iki.fi>
+- Unrud <Unrud@MASKED> (gh: @unrud)
+- X O <xo@MASKED>
+- Yaron de Leeuw <me@jarondl.net> (gh: @jarondl)
+- Zbigniew Jędrzejewski-Szmek <zbyszek@MASKED>
+- bachmann <bachmann.matt@MASKED>
+- bjv <brandon.vanvaerenbergh@MASKED> (@bjamesvERT)
+- gl <gl@MASKED>
+- labrys <labrys@MASKED> (gh: @labrys)
+- ms-boom <ms-boom@MASKED>
+- ryanss <ryanssdev@MASKED> (gh: @ryanss)
+
+Unless someone has deliberately given permission to publish their e-mail, I have masked the domain names. If you are not on this list and believe you should be, or you *are* on this list and your information is inaccurate, please e-mail the current maintainer or the mailing list (dateutil@python.org) with your name, e-mail (if desired) and github (if desired / applicable), as you would like them displayed. Additionally, please indicate if you are willing to dual license your old contributions under Apache 2.0.
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LICENSE

+Copyright 2017- Paul Ganssle <paul@ganssle.io>
+Copyright 2017- dateutil contributors (see AUTHORS file)
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
+The above license applies to all contributions after 2017-12-01, as well as
+all contributions that have been re-licensed (see AUTHORS file for the list of
+contributors who have re-licensed their code).
+--------------------------------------------------------------------------------
 dateutil - Extensions to the standard Python datetime module.
 
 Copyright (c) 2003-2011 - Gustavo Niemeyer <gustavo@niemeyer.net>
 Copyright (c) 2012-2014 - Tomi Pieviläinen <tomi.pievilainen@iki.fi>
 Copyright (c) 2014-2016 - Yaron de Leeuw <me@jarondl.net>
 Copyright (c) 2015-     - Paul Ganssle <paul@ganssle.io>
+Copyright (c) 2015-     - dateutil contributors (see AUTHORS file)
 
 All rights reserved.
 
@@ -30,3 +50,5 @@ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+The above BSD License Applies to all code, even that also covered by Apache 2.0.
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