Add release announcment.

Author: jseabold

index.rst

@@ -21,6 +21,8 @@ Statsmodels runs on Python 2.5 through 3.2. To learn more about statsmodels have
 Announcements
 =============
 
+* **Statsmodels 0.5.0 Release**: A new major release was made on August 14, 2013. All users are encouraged to upgrade to this version.
+
 * **Google Summer of Code 2013**: We have had two students accepted to work on statsmodels as part of the `Google Summer of Code <https://developers.google.com/open-source/soc/>`_ `2013 <https://www.google-melange.com/gsoc/homepage/google/gsoc2013>`_. The first project will focus on improving the discrete choice models, adding, for example, Conditional Logit, Nested Logit, and Mixed Logit models. The second project will focus on time series analysis, including regime-switching models such as SETAR, STAR, and Markov Switching models.
 
 * **PyData New York Fall 2012**: There was a talk on using formulas with statsmodels with Patsy at the `PyData <http://pydata.org/>`_ `NYC Conference Fall 2012 <http://nyc2012.pydata.org/schedule/>`_. Slides are available `here <http://jseabold.net/presentations/seabold_pydata2012.html#slide1>`_. The notebooks for the talk are available in this `Github repo <https://github.com/jseabold/538model>`_.