Lab part 1 submission question

[mikeizbicki]

Copied from https://github.com/mikeizbicki/lab-goodreads/issues/2:

For the submission for part 1 of the lab, when you ask for the total number of books that have been reviewed or not reviewed, should we count the total number of unique books, or just count the total number?

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I intended the question to ask for the total number of reviews, possibly allowing for duplicate books if they've been reviewed by multiple users. If you answered the question with distinct books, however, that will be fine as long as the query is correct. I would welcome a pull request that clarifies this.