Dino Dex First Refactor

Let me know when you have a few minutes.  I want to go over a few of the questions you had which I haven't yet done anything with.
You should refactor lines 24, 25 by having a method on `Dinosaur` called `def passes_filter?(key, operator, value)` that does this for you. Here you would just pass the three values to it e.g. `object.passes_filter?(key, operator, value)`.