Throughput Graph in readme.rst file does not show image.

[eqj619]

Problem: Throughput Graph in readme.rst file does not show image.

readme.rst Line 12 |Throughput Graph|

readme.rst Line 184-186

.. |Throughput Graph| image:: https://graphs.waffle.io/coala/coala-bears/throughput.svg
   :target: https://waffle.io/coala/coala-bears/metrics/throughput
   :alt: 'Throughput Graph'

host at this images is no longer available.

$ ping graphs.waffle.io
ping: cannot resolve graphs.waffle.io: Unknown host
$ ping waffle.io
ping: cannot resolve waffle.io: Unknown host