Fix requirements list for PyPi

[caternuson]

Commas? Hopefully that's all it is.

currently:

pi@raspberrypi:~ $ pip3 install --no-cache-dir adafruit-circuitpython-mcp9600
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting adafruit-circuitpython-mcp9600
  Downloading https://www.piwheels.org/simple/adafruit-circuitpython-mcp9600/adafruit_circuitpython_mcp9600-1.0.1-py3-none-any.whl
Collecting Adafruit-Blinkaadafruit-circuitpython-busdeviceadafruit-circuitpython-register (from adafruit-circuitpython-mcp9600)
  Could not find a version that satisfies the requirement Adafruit-Blinkaadafruit-circuitpython-busdeviceadafruit-circuitpython-register (from adafruit-circuitpython-mcp9600) (from versions: )
No matching distribution found for Adafruit-Blinkaadafruit-circuitpython-busdeviceadafruit-circuitpython-register (from adafruit-circuitpython-mcp9600)

[caternuson]

full disclosure...@kattni showed me the answer.