Example should be renamed to include simpletest

[kattni]

Example onewire_demo.py should be renamed to onewire_simpletest.py to fit with CircuitPython library standards.

The lines including this file name in the docs/examples.rst file must also be updated to reflect the name change, e.g.:

.. literalinclude:: ../examples/current_file_name.py
    :caption: examples/current_file_name.py
    :linenos:

would be updated to:

.. literalinclude:: ../examples/current_file_name_changed.py
    :caption: examples/current_file_name_changed.py
    :linenos:

[sreekaransrinath]

Hey, I'd like to take this issue up!

[ladyada]

go for it!!! 🎃

[sreekaransrinath]

Yeah, I finished it right after I commented :)

[shlok-goud]

Hi. I would like to take up this issue for my first pull requests.

[ladyada]

@shlok-goud oops this was already done
#13
we have lots more hacktober PRs very similar to this one!