Merge pull request #154 from dastels/master

Add IterTools library

Author: brentru

.gitmodules

@@ -430,3 +430,6 @@
 [submodule "libraries/drivers/dymoscale"]
 	path = libraries/drivers/dymoscale
 	url = https://github.com/adafruit/Adafruit_CircuitPython_DymoScale.git
+[submodule "libraries/helpers/itertools"]
+	path = libraries/helpers/itertools
+	url = https://github.com/adafruit/Adafruit_CircuitPython_IterTools.git

docs/drivers.rst

@@ -52,6 +52,7 @@ These libraries build on top of the low level APIs to simplify common tasks.
     Framebuf Module <https://circuitpython.readthedocs.io/projects/framebuf/en/latest/>
     Image Load <https://circuitpython.readthedocs.io/projects/imageload/en/latest/>
     InfraRed Remote <https://circuitpython.readthedocs.io/projects/irremote/en/latest/>
+    IterTools <https://circuitpython.readthedocs.io/projects/itertools/en/latest/>
     LED Animation <https://adafruit-circuitpython-led-animation.readthedocs.io/en/latest/>
     Logging  <https://circuitpython.readthedocs.io/projects/logging/en/latest/>
     Mini ESP Tool <https://circuitpython.readthedocs.io/projects/miniesptool/en/latest/>