create --config-dump file

[CouldBeThis]

I think the instructions in Creating a Config File are a bit complex for people who are not sophisticated cli users.

Would it be possible to change the program so it can handle that like by specifying the filename? e.g. --config-dump ".mnamer-v2.json.tmp" or --config-dump -o ".mnamer-v2.json.tmp" etc

then you could check so as not to over write an existing file