azure.iot.hub.protocol.models -> azure.iot.hub.models per release 2.01 (#21)

* azure.iot.hub.protocol.models -> azure.iot.hub.models

* updated readme file to include python versions later than 3.5.x

Author: JimacoMS3

README.md

@@ -14,7 +14,7 @@ azure-iot-samples-python provides a set of easy-to-understand, continuously-test
 
 ## Prerequisites
 
-- Python 2.7.x or 3.5.x on your development machine.  You can download Python for multiple platforms from [Python.org](https://www.python.org/downloads/).  You can verify the current version of Python on your development machine using 'python --version' or 'python3 --version'
+- Python 2.7.x or 3.5.x (or later) on your development machine.  You can download Python for multiple platforms from [Python.org](https://www.python.org/downloads/).  You can verify the current version of Python on your development machine using 'python --version' or 'python3 --version'
 
 ## Resources
 

iot-hub/Quickstarts/back-end-application/BackEndApplication.py

@@ -8,7 +8,7 @@
 # pylint: disable=E0611
 
 from azure.iot.hub import IoTHubRegistryManager
-from azure.iot.hub.protocol.models import CloudToDeviceMethod, CloudToDeviceMethodResult
+from azure.iot.hub.models import CloudToDeviceMethod, CloudToDeviceMethodResult
 
 from builtins import input