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Add `reqwest` and `scraper` dependencies to the `trpl` crate. Wrap them in `trpl` re-exports which keep the API surface low. Rewrite the whole first section to use `race` along with those `trpl` re-exports to show a more “real” example of async code right form the start, including actual concurrency, unlike the previous introduction. Update 17.03 to account for having introduced `race` already, and update listing numbers for rewritten 17.01. The *inclues* for them were fixed already, but not these!