remove broken bitdeli badge from readme

Author: wbolster

README.rst

@@ -14,8 +14,3 @@ HBase_.
 .. If you're reading this from the README.rst file in a source tree,
    you can generate the HTML documentation by running "make doc" and browsing
    to doc/build/html/index.html to see the result.
-
-
-.. image:: https://d2weczhvl823v0.cloudfront.net/wbolster/happybase/trend.png
-   :alt: Bitdeli badge
-   :target: https://bitdeli.com/free