Update for 3.1.0 release

Author: willkg

CHANGES

@@ -1,8 +1,8 @@
 Bleach changes
 ==============
 
-Version 3.1.0 (In development)
-------------------------------
+Version 3.1.0 (January 9th, 2019)
+---------------------------------
 
 **Security fixes**
 
@@ -31,6 +31,8 @@ None
 * Fix ``InputStreamWithMemory`` when the ``BleachHTMLParser`` is
   parsing ``meta`` tags. (#431)
 
+* Fix doctests. (#357)
+
 
 Version 3.0.2 (October 11th, 2018)
 ----------------------------------

CONTRIBUTORS

@@ -18,21 +18,25 @@ Contributors:
 - Adam Lofts
 - Adrian "ThiefMaster"
 - Alek
-- Alexandre Macabies
-- Alexandr N. Zamaraev
 - Alex Defsen
 - Alex Ehlke
+- Alexandre Macabies
+- Alexandr N. Zamaraev
 - Alireza Savand
 - Andreas Malecki
 - Andy Freeland
 - Antoine Leclair
+- Anton Backer
 - Anton Kovalyov
+- Chad Birch
 - Chris Beaven
 - Dan Gayle
+- dave-shawley
 - Erik Rose
 - Gaurav Dadhania
 - Geoffrey Sneddon
 - Greg Guthe
+- hugovk
 - Istvan Albert
 - Jaime Irurzun
 - James Socol
@@ -49,15 +53,19 @@ Contributors:
 - Mark Lee
 - Mark Paschal
 - mdxs
+- Nikita Sobolev
 - nikolas
 - Oh Jinkyun
 - Paul Craciunoiu
 - Ricky Rosario
 - Ryan Niemeyer
 - Sébastien Fievet
 - sedrubal
+- Stephane Blondon
+- Stu Cox
 - Tim Dumol
 - Timothy Fitz
+- Vadim Kotov
 - Vitaly Volkov
 - Will Kahn-Greene
 - Zoltán

bleach/__init__.py

@@ -18,9 +18,9 @@
 
 
 # yyyymmdd
-__releasedate__ = ''
+__releasedate__ = '20190109'
 # x.y.z or x.y.z.dev0 -- semver
-__version__ = '3.1.0.dev0'
+__version__ = '3.1.0'
 VERSION = parse_version(__version__)