Add pip command fix

Author: timlt

includes/iot-develop-send-telemetry-iot-hub-python.md

@@ -94,7 +94,7 @@ In this section, you use the Python SDK to send messages from a device to your I
 1. Run the code for the following sample file.
 
     ```console
-    python3 iothub_simple_telemetry.py
+    pip install azure-iot-device==3.0.0b2
     ```
     > [!NOTE]
     > This code sample uses Azure IoT Plug and Play, which lets you integrate smart devices into your solutions without any manual configuration.  By default, most samples in this documentation use IoT Plug and Play. To learn more about the advantages of IoT Plug and Play, and cases for using or not using it, see [What is IoT Plug and Play?](../articles/iot-develop/overview-iot-plug-and-play.md).