Update README.rst

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README.rst

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 .. image:: https://readthedocs.org/projects/cppformat/badge/?version=stable
    :target: http://cppformat.readthedocs.org/en/stable/
    :alt: Documentation Status
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+.. image:: https://webapi.biicode.com/v1/badges/vitaut/vitaut/cppformat/master
+  :target: https://www.biicode.com/vitaut/cppformat
 
 C++ Format is an open-source formatting library for C++.
 It can be used as a safe alternative to printf or as a fast