Add release announcement

Author: nicoddemus

doc/en/announce/release-3.0.0.rst

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+pytest-3.0.0
+============
+
+The pytest team is proud to announce the 3.0.0 release!
+
+pytest is a mature Python testing tool with more than a 1600 tests
+against itself, passing on many different interpreters and platforms.
+
+This release contains a lot of bugs and improvements, and much of
+the work done on it was possible because of the 2016 Sprint[1], which
+was funded by an indiegogo campaign which raised over US$12,000 with 
+nearly 100 backers. 
+
+There's a "What's new in pytest 3.0" [2] blog post highlighting the 
+major features in this release.
+
+To see the complete changelog and documentation, please visit:
+
+    http://docs.pytest.org
+
+As usual, you can upgrade from pypi via:
+
+    pip install -U pytest
+
+Thanks to all who contributed to this release, among them:
+
+    AbdealiJK
+    Ana Ribeiro
+    Antony Lee
+    Brandon W Maister
+    Brianna Laugher
+    Bruno Oliveira
+    Ceridwen
+    Christian Boelsen
+    Daniel Hahler
+    Danielle Jenkins
+    Dave Hunt
+    Diego Russo
+    Dmitry Dygalo
+    Edoardo Batini
+    Eli Boyarski
+    Florian Bruhin
+    Floris Bruynooghe
+    Greg Price
+    Guyzmo
+    HEAD KANGAROO
+    JJ
+    Javi Romero
+    Javier Domingo Cansino
+    Kale Kundert
+    Kalle Bronsen
+    Marius Gedminas
+    Matt Williams
+    Mike Lundy
+    Oliver Bestwalter
+    Omar Kohl
+    Raphael Pierzina
+    RedBeardCode
+    Roberto Polli
+    Romain Dorgueil
+    Roman Bolshakov
+    Ronny Pfannschmidt
+    Stefan Zimmermann
+    Steffen Allner
+    Tareq Alayan
+    Ted Xiao
+    Thomas Grainger
+    Tom Viner
+    TomV
+    Vasily Kuznetsov
+    aostr
+    marscher
+    palaviv
+    satoru
+    taschini
+
+
+Happy testing,
+The py.test Development Team
+
+[1] http://blog.pytest.org/2016/pytest-development-sprint/
+[2] http://blog.pytest.org/2016/whats-new-in-pytest-30/