New argument for single and multiple url testing by terminal command

[RabbyXQ]

python3 openredirex.py -u "https://app.productboard.com/?redirect_to=https://nanoporetech.productboard.com" -p payloads.txt

python3 openredirex.py -Uu "https://app.productboard.com/?redirect_to=https://nanoporetech.productboard.com","https://example.com/?ref=https://ankara.com" -p payloads.txt