Merge pull request adafruit#536 from adafruit/as7331

adding as7331

Author: FoamyGuy

.gitmodules

@@ -1154,3 +1154,6 @@
 [submodule "libraries/drivers/ssd1677"]
 	path = libraries/drivers/ssd1677
 	url = https://github.com/adafruit/Adafruit_CircuitPython_SSD1677.git
+[submodule "libraries/drivers/as7331"]
+	path = libraries/drivers/as7331
+	url = https://github.com/adafruit/Adafruit_CircuitPython_AS7331.git

docs/drivers.rst

@@ -464,6 +464,7 @@ These sensors detect light related attributes such as ``color``, ``light`` (unit
 
     APDS9960 Proximity, Light, RGB, and Gesture (adafruit_apds9960) <https://docs.circuitpython.org/projects/apds9960/en/latest/>
     AS726x Color Spectrum Sensor (adafruit_as726x) <https://docs.circuitpython.org/projects/as726x/en/latest/>
+    AS7331 UV / UVA / UVB / UVC Sensor (adafruit_as7331) <https://docs.circuitpython.org/projects/as7331/en/latest/>
     AS7341 11-Channel Multi-Spectral Digital Sensor (adafruit_as7341) <https://docs.circuitpython.org/projects/as7341/en/latest/>
     BH1750 Ambient Light (adafruit_bh1750) <https://docs.circuitpython.org/projects/bh1750/en/latest/>
     GUVx I2C UV Light Sensors (adafruit_guvx-i2c) <https://docs.circuitpython.org/projects/guvx-i2c/en/latest/>