unpin sphinx and add sphinx-rtd-theme to docs reqs

Signed-off-by: foamyguy <[email protected]>

"fix rtd theme

"

Merge pull request adafruit#50 from FoamyGuy/jquery_fix

add sphinxcontrib.jquery

Merge pull request adafruit#49 from tyeth/patch-1

Update adafruit_logging.py for no args

Merge pull request adafruit#47 from dsanders11/patch-1

Fix typo in docstring

Merge pull request adafruit#48 from dsanders11/patch-3

Make StreamHandler terminator configurable

Merge pull request adafruit#45 from vladak/mqtt_handler_example

add MQTT handler example

Merge pull request adafruit#44 from vladak/multiple_handlers

allow multiple handlers per logger

Merge pull request adafruit#42 from tekktrik/dev/fix-pylint-errors

Fix pylint errors

Merge pull request adafruit#41 from isacben/fix-default-logging-level

Make default logging level be consistent with CPython