Update Google Spreadsheets example

[russfeld]

This updates the code in the Google Spreadsheets example to work with the latest changes to Google's APIs as of June 4, 2019.

Changes:

• Add 'https://www.googleapis.com/auth/drive' to 'scope' to allow the program to interact with Google Drive (see issue Google Authentication Error #90)
• Add '.isoformat()' to 'worksheet.append_row((datetime.datetime.now().isoformat(), temp, humidity))' to solve problems with 'datetime.datetime' not being JSON serializable.

This was tested using Python 3.5.3 running on Raspberry Pi 3 B+. I am not aware of any limitations to this change.

Library versions relevant to this example:

• oauth2client 4.1.3
• gspread 3.1.0
• pyasn1 0.4.5 (required manual update in my setup)
• pyasn1-modules 0.2.5 (required manual update in my setup)

[brentru]

@russfeld Thank you for updating this code. I verified this works correctly using the same setup on my end.

Pi Output

pi@raspberrypi:~/Adafruit_Python_DHT/examples $ python3 spread_update.py
Logging sensor measurements to DHT every 30 seconds.
Press Ctrl-C to quit.
Temperature: 23.1 C
Humidity:    41.8 %
Wrote a row to DHT

Sheet Output

Date/Time | Temperature C | Humidity %
2019-06-11T17:44:23.842567 | 23.10000038 | 41.79999924