Describe the bug
In feature/python3.8 the scanner.py config.json location is giving error.
To Reproduce
Steps to reproduce the behavior:

1. Go to 'feature/python3.8' in '/src/single/' folder
2. Run the scanner.py

Expected behavior
It should give the open ports. But it gives error 'file not found'

Would it be possible to add support for excluding specific ports? I'm thinking this could be an additional argument passed to the script (a comma-delimited list of ports).

An example call could look like the following:

portforge.cr localhost 4440 4445 4442,4443

This would exclude ports 4442 and 4443.

The reasoning behind my feature request is that I might want to run a web server on