Update the Python intersphinx reference to Python 3 https.

Author: tannewt

conf.py

@@ -319,6 +319,6 @@
 
 
 # Example configuration for intersphinx: refer to the Python standard library.
-intersphinx_mapping = {'http://docs.python.org/': None,
+intersphinx_mapping = {'https://docs.python.org/3/': None,
                        'https://circuitpython.readthedocs.io/projects/bus_device/en/latest/': None,
                        'https://circuitpython.readthedocs.io/projects/register/en/latest/': None}