Updated readme

Author: Bernardo-MG

README.rst

@@ -117,7 +117,7 @@ This will delegate the execution to tox.
 
 It is possible to run just one of the test profiles, in this case the py36 profile:
 
-``python setup.py test -p "py36"``
+``python setup.py test -p "py38"``
 
 Collaborate
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