Fixing datetime code (#295)

* Update README.md

* Spelling fixes

* Update hardware.md

* Adding IoT for beginners episode

* Adding intro video

* Fixing formatting of read more and self study sections.

* Adding instructions for installing the ReSpeaker

* Adding auth to language understanding

* Adding Wio terminal timer setting

* Update config.h

* Fixing links and images

* Increasing version numbers for SD card fix

* Adding SD card requirement

* speech and translations

* Adding more on translations

* All Wio Terminal now working except playing audio

* Adding more details on virtual environments.

* Fixing tracking links

* Update app.py

2-farm/lessons/1-predict-plant-growth/code-server/temperature-sensor-server/app.py

@@ -5,7 +5,7 @@ import paho.mqtt.client as mqtt
 
 from os import path
 import csv
-import datetime
+from datetime import datetime
 
 id = '<ID>'