When creating feeds, also add the first value

[Technik-Tueftler]

What

When creating feeds, also add the first value to avoid an error at the start. The problem is that the following error is raised at line 76:

Zurückverfolgung (jüngste Aufforderung zuletzt): Datei "code.py", 
Zeile 74, in <module> Datei "adafruit_io/adafruit_io.py", 
Zeile 707, in receive_data Datei "adafruit_io/adafruit_io.py", 
Zeile 588, in _get Datei "adafruit_io/adafruit_io.py", 
Zeile 554, in _handle_error AdafruitIO_RequestError: Adafruit IO Error 404: not found - API documentation can be found at https://io.adafruit.com/api/docs

if the feed is there but no values. I just took the average value and push it directly when creating the feeds.

Test

Tested under the same hardware configuration as described in the instructions: https://learn.adafruit.com/two-way-display-with-analog-feedback-servos/code-the-two-way-telegraph