added debug for import

Signed-off-by: Ebbe Baß <ebbe@ping-mee.de>

main.py

@@ -10,6 +10,7 @@ try:
     import RPi.GPIO as GPIO
 except ImportError:
     print('Some modules are missing. Try to install them with "pip3 install -r requirements.txt"')
+    print(ImportError)
     exit()
 
 sys.path.append('./SDL_Adafruit_ADS1x15')