Update careers.md

[filinpavel]

added Black Hat Python

[dguido]

I wrote this page back in 2009. It probably should get an update! Let me consider a few larger edits this afternoon. (ps. I agree with your book recommendation in 2015)

[filinpavel]

Great! Waiting for an update!

[dguido]

This has now turned into an entire blog post haha

[aljavier]

@filinpavel @dguido hey guys is 2019 and the issue is still open and the edits pending :)

Just a reminder.

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