helper:
$ python3 check_certif.py -h
usage: check_certif.py [-h] [-u URLS] [-f FILE] [-w WARNING]
SSL Check
optional arguments:
-h, --help show this help message and exit
-u URLS, --url URLS url to check (default: [])
-f FILE, --file FILE file with urls (one per line) (default: None)
-w WARNING, --warning WARNING
display warning if the number of days is lower than
this value (default: 10)
$ python3 check_certif.py -u google.com
[OK]: the SSL cerfificate of google.com expires in 47 days