sqli-lab13.py: update line 24

[hftamayo]

Hi, about sqli's lab13 please change line24, there's a typo in the script:
pring("(+) Example: %s www.example.com" % sys.argv[0])
Please update it using something like this:
print("(+) Example: %s www.example.com" % sys.argv[0])

Of course it's no big deal but for new folks in code, this might be challenging. By the way, in the video walkthrough this typo is evident as well, a quick note might be useful

hftamayo