feature to download by hash from any available services

[psifertex]

My primary use-case for malwoverview would be to download a hash by name from whatever services had it available. I'd love to have an option to simply provide the sha256 and have the script try all services for which I have API keys included until a download is found. Is this a feature you'd consider accepting a PR for or adding yourself?

Unrelated (happy to file a separate issue but don't want to spam you with too many requests!): have you considered using pathlib.Path so you don't have to do things like https://github.com/alexandreborges/malwoverview/blob/master/malwoverview/malwoverview.py#L68-L74 ?