update Readme.md for python version

Readme.md

@@ -1,8 +1,9 @@
-# Abba: A/B test analysis in Javascript
+# Abba: A/B test analysis in Javascript and Python
 
-Abba is a Javascript library for A/B test analysis. It analyzes tests with binomial outcomes for any
-number of groups. You can use the library (in `abba/`) to just compute statistics or to render a
+Abba is a library for A/B test analysis. It analyzes tests with binomial outcomes for any number of
+groups. You can use the Javascript library (in `abba/`) to just compute statistics or to render a
 nice table summarizing those statistics. There's a handy little app in `demo/` which demonstrates
-how to use the library.
+how to use the library. There's a Python version under `python/`, also available on
+[PyPI](http://pypi.python.org/pypi/ABBA/).
 
-You can find plenty more details on the [live demo](http://www.thumbtack.com/labs/abba).
+You can find plenty more details on the [live demo](http://www.thumbtack.com/labs/abba).