fix codecov link

Author: dojutsu-user

README.rst

@@ -70,10 +70,10 @@ when you push to GitHub.
     :scale: 100%
     :target: https://docs.readthedocs.io/en/latest/?badge=latest
 
-.. |coverage| image:: https://codecov.io/gh/rtfd/readthedocs.org/branch/master/graph/badge.svg
+.. |coverage| image:: https://codecov.io/gh/readthedocs/readthedocs.org/branch/master/graph/badge.svg
     :alt: Test coverage
     :scale: 100%
-    :target: https://codecov.io/gh/rtfd/readthedocs.org
+    :target: https://codecov.io/gh/readthedocs/readthedocs.org
 
 License
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