Updated link to logo in README so it animates

Author: neozenith

README.rst

@@ -8,7 +8,7 @@ VCR.py 📼
 
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-.. image:: https://raw.github.com/kevin1024/vcrpy/master/vcr.png
+.. image:: https://vcrpy.readthedocs.io/en/latest/_images/vcr.svg
    :alt: vcr.py logo
    :align: right