Print help if no arguments passed to typo.py

[corneliusroemer]

It's customary to print usage/help if a user doesn't pass any arguments or options to a program that expects an input.

Current behaviour:

$ python ail_typo_squatting/typo.py
[-] No Entry

Expected:

$ python ail_typo_squatting/typo.py
usage: typo.py [-h] [-v] [-dn DOMAINNAME [DOMAINNAME ...]] [-fdn FILEDOMAINNAME] [-o OUTPUT] [-fo FORMATOUTPUT] [-br] [-dnsr] [-dnsl]
               [-l LIMIT] [-var] [-ko] [-a] [-om] [-repe] [-repl] [-drepl] [-cho] [-add] [-md] [-sd] [-vs] [-ada] [-hg] [-ahg] [-cm] [-hp]
               [-wt] [-wsld] [-at] [-sub] [-sp] [-cdd] [-addns] [-uddns] [-ns] [-combo] [-ca]

options:
  -h, --help            show this help message and exit
  -v                    verbose, more display
  -dn DOMAINNAME [DOMAINNAME ...], --domainName DOMAINNAME [DOMAINNAME ...]
                        list of domain name
  -fdn FILEDOMAINNAME, --filedomainName FILEDOMAINNAME
                        file containing list of domain name
  -o OUTPUT, --output OUTPUT
                        path to ouput location
  -fo FORMATOUTPUT, --formatoutput FORMATOUTPUT
                        format for the output file,
...snip