DOC Add 0.3.1 release information.

Author: twiecki

WHATSNEW.md

@@ -2,6 +2,40 @@
 
 These are new features and improvements of note in each release.
 
+## v0.3.1 (Nov 12, 2015)
+
+This is a minor release from 0.3 that includes mostly bugfixes but also some new features. We recommend that all users upgrade to this new version.
+
+### New features
+
+* Add Information Ratio [PR194](https://github.com/quantopian/pyfolio/pull/194) by @MridulS
+* Bayesian tear-sheet now accepts 'Fama-French' option to do Bayesian multivariate regression against Fama-French risk factors [PR200](https://github.com/quantopian/pyfolio/pull/200) by Shane Bussman
+* Plotting of monthly returns [PR195](https://github.com/quantopian/pyfolio/pull/195)
+
+### Bug fixes
+
+* `pos.get_percent_alloc` was not handling short allocations correctly [PR201](https://github.com/quantopian/pyfolio/pull/201)
+* UTC bug with cached Fama-French factors [commit](https://github.com/quantopian/pyfolio/commit/709553a55b5df7c908d17f443cb17b51854a65be)
+* Sector map was not being passed from `create_returns_tearsheet` [commit](https://github.com/quantopian/pyfolio/commit/894b753e365f9cb4861ffca2ef214c5a64b2bef4)
+* New sector mapping feature was not Python 3 compatible [PR201](https://github.com/quantopian/pyfolio/pull/201)
+
+
+### Maintenance
+
+* We now depend on pandas-datareader as the yahoo finance loaders from pandas will be deprecated [PR181](https://github.com/quantopian/pyfolio/pull/181) by @tswrightsandpointe
+
+### Contributors
+
+Besiders the core developers, we have seen an increase in outside contributions which we greatly appreciate. Specifically, these people contributed to this release:
+
+* Shane Bussman
+* @MridulS
+* @YihaoLu
+* @jkrauss82
+* @tswrightsandpointe
+* @cgdeboer
+
+
 ## v0.3 (Oct 23, 2015)
 
 This is a major release from 0.2 that includes many exciting new features. We recommend that all users upgrade to this new version.