Add a Bitdeli badge to README

Author: bitdeli-chef

README.rst

@@ -59,3 +59,9 @@ Changelog
       in ``__init__.py`` before, and ``__init__`` just imports things and sets
       ``__all__`` and ``__version__``, as is typically recommended now.
    -  Drops support for Python 2.5.
+
+
+.. image:: https://d2weczhvl823v0.cloudfront.net/drmaa-python/drmaa-python/trend.png
+   :alt: Bitdeli badge
+   :target: https://bitdeli.com/free
+