Added vuln_publication_date feature

[z3n0wl]

I hope it is useful for you as it is for me

[djcas9]

@z3n0wl for some reason the rest of the pull requests wont merge automatically from the github interface.

I have a rule if someone submit one good pull request I give them full read/write access to the repo. You qualify for that for sure. You now have write access to this repo and feel free to push new features and fix bugs. I'll get the rest of your commits merged in soon or you can merge them in yourself.

Thank you very much for contributing. :)

[z3n0wl]

Thank you too for the great work you've been done. I'll clone asap your repository and work with this for merge the other features.

[djcas9]

@z3n0wl no, thank you :)