added argsparse module

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

main.py

@@ -8,6 +8,7 @@ try:
     import RPi.GPIO as GPIO
     from flask import Flask
     import json
+    from argparse import ArgumentParser
 except ImportError:
     print('Some modules are missing. Try to install them with "pip3 install -r requirements.txt"')
     exit()