Merge pull request #332 from kattni/scd4x

Add SCD4x to bundle.

Author: kattni

.gitmodules

@@ -839,3 +839,6 @@
 [submodule "libraries/helpers/ticks"]
 	path = libraries/helpers/ticks
 	url = https://github.com/adafruit/Adafruit_CircuitPython_Ticks
+[submodule "libraries/drivers/scd4x"]
+	path = libraries/drivers/scd4x
+	url = https://github.com/adafruit/Adafruit_CircuitPython_SCD4X.git

docs/drivers.rst

@@ -377,6 +377,7 @@ equivalent carbon dioxide (``eco2`` / ``eCO2``), and total volatile organic comp
     PCT2075 Temperature Sensor <https://circuitpython.readthedocs.io/projects/pct2075/en/latest/>
     PM25 Air Quality Sensor <https://circuitpython.readthedocs.io/projects/pm25/en/latest/>
     SCD30 CO2, Temperature, and Humidity Sensor <https://circuitpython.readthedocs.io/projects/scd30/en/latest/>
+    SCD4x Temperature and Humidity Sensor <https://circuitpython.readthedocs.io/projects/scd4x/en/latest/>
     SGP30 Air Quality <https://circuitpython.readthedocs.io/projects/sgp30/en/latest/>
     SHT31-D Temperature and Humidity <https://circuitpython.readthedocs.io/projects/sht31d/en/latest/>
     SHT4x Temperature and Humidity <https://circuitpython.readthedocs.io/projects/sht4x/en/latest/>