Feature Request: Read multiple domains from txt file

[Hostn4me]

I am absolutely loving this repo and I feel if you added a feature to where it could read a list of domain names (example: "github.com" - no quotes) from a txt file with each domain being on it's own new line, this would make the script not only 10x better in my opinion, but also 100x more productive and less time-consuming to utilize.

With the above said, I understand this project is in its beginning stages, and that's why I am requesting this feature. Furthermore, if you do end up adding this feature, although this would in no way be required, an added bonus would be utilizing multithreads to dump the subdomains contained within any txt file specified on the command line at a much faster pace. However, as I said, this would only be an added bonus (maybe something to consider down the road). As far as I'm concerned, reading multiple domains from a txt file while using a single thread would be just fine! =)

Thanks for your time and consideration.

[Edu4rdSHL]

Take a look to https://github.com/Edu4rdSHL/findomain