Merge pull request #27 from raybellwaves/patch-1

DOC: add pypi badge

README.rst

@@ -1,7 +1,7 @@
 xbatcher: Batch Generation from Xarray Datasets
 ===============================================
 
-|Build Status| |codecov| |docs| |license|
+|Build Status| |codecov| |docs| |pypi| |license|
 
 
 Xbatcher is a small library for iterating xarray DataArrays in batches. The
@@ -19,6 +19,10 @@ such as Keras_. View the |docs| for more info.
    :alt: code coverage
 .. |docs| image:: http://readthedocs.org/projects/xbatcher/badge/?version=latest
    :target: http://xbatcher.readthedocs.org/en/latest/?badge=latest
+   :alt: docs
+.. |pypi| image:: https://img.shields.io/pypi/v/xbatcher.svg
+   :target: https://pypi.python.org/pypi/xbatcher
+   :alt: pypi
 .. |license| image:: https://img.shields.io/github/license/mashape/apistatus.svg
    :target: https://github.com/pangeo-data/xbatcher
    :alt: license