Dino dex

Refactored code and cleaned up arrowheads following discussion with Dan
`dino[:diet] = (dino[:diet].eql? "Yes") ? "Carnivore" : "Herbivore"`? or:

```ruby
DIET_MAPPINGS = { "Yes" => "Carnivore", "No" => "Herbivore" }

dino[:diet] = DINO_MAPPINGS[dino[:diet]]
```