Merge pull request #260 from kattni/tc74-add

Adding TC74 to bundle.

Author: ladyada

.gitmodules

@@ -712,3 +712,6 @@
 [submodule "libraries/helpers/matrixportal"]
 	path = libraries/helpers/matrixportal
 	url = https://github.com/adafruit/Adafruit_CircuitPython_MatrixPortal.git
+[submodule "libraries/drivers/tc74"]
+	path = libraries/drivers/tc74
+	url = https://github.com/adafruit/Adafruit_CircuitPython_TC74.git

docs/drivers.rst

@@ -355,6 +355,7 @@ equivalent carbon dioxide (``eco2`` / ``eCO2``), and total volatile organic comp
     SHT31-D Temperature and Humidity <https://circuitpython.readthedocs.io/projects/sht31d/en/latest/>
     SHTC3 Temperature and Humidity <https://circuitpython.readthedocs.io/projects/shtc3/en/latest/>
     Si7021 Temperature and Humidity <https://circuitpython.readthedocs.io/projects/si7021/en/latest/>
+    TC74 Digital Temperature Sensor <https://circuitpython.readthedocs.io/projects/tc74/en/latest/>
     Thermistor Temperature <https://circuitpython.readthedocs.io/projects/thermistor/en/latest/>
     TMP006 Contactless IR Thermopile Sensor <https://circuitpython.readthedocs.io/projects/tmp006/en/latest/>
     TMP007 Contactless Temperature <https://circuitpython.readthedocs.io/projects/tmp007/en/latest/>