added in micropython external library for const feature.

it's returing valid attribute arrays, that just need converted on z2m
side.

it's also respecting the stop command from the console, which I will
attempt to expose as just a button press.

venv/Lib/site-packages/pyserial-3.5.dist-info/DESCRIPTION.rst

@@ -0,0 +1,13 @@
+Python Serial Port Extension for Win32, OSX, Linux, BSD, Jython, IronPython
+
+Stable:
+
+- Documentation: http://pythonhosted.org/pyserial/
+- Download Page: https://pypi.python.org/pypi/pyserial
+
+Latest:
+
+- Documentation: http://pyserial.readthedocs.io/en/latest/
+- Project Homepage: https://github.com/pyserial/pyserial
+
+