helpscout / helix / 73

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Add new derived function for better computeds

:pear: with @alisdair to add a new function that allows you to create
computed values based on existing data within the shape of the Spec.

**Example**
```js
const Spec = createSpec({
  fname: () => 'Alice',
  lname: () => 'Baker',
  name: derived(({ fname, lname }) => `${fname} ${lname}`)
})
const fixture = Spec.generate()
```

**Output**
```
Alice Baker
```

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