Efficient credentials scanning

[kmmanoj]

This PR solves issue #46

What does this solve?

• Data loss - the regex filtering sometimes does not extract the right word. In this fix, it does not regex filter from the text.
• Moreover, it uses a more generalised search query.

How does it get?
It looks out sensitive words and gets the text. The text is put as it is in the file

[emtunc]

Thanks for the PR @kmmanoj - apologies it's taken this long to actually look at it. I'm going to see if I can further improve this as it wasn't catching some passwords in some tests of mine for some reason.