fix pepy badge url (hardbyte#1649)

Author: zariiii9003

README.rst

@@ -17,11 +17,11 @@ python-can
    :target: https://pypi.python.org/pypi/python-can/
    :alt: Supported Python implementations
 
-.. |downloads| image:: https://pepy.tech/badge/python-can
+.. |downloads| image:: https://static.pepy.tech/badge/python-can
    :target: https://pepy.tech/project/python-can
    :alt: Downloads on PePy
 
-.. |downloads_monthly| image:: https://pepy.tech/badge/python-can/month
+.. |downloads_monthly| image:: https://static.pepy.tech/badge/python-can/month
    :target: https://pepy.tech/project/python-can
    :alt: Monthly downloads on PePy