Merge #1579

1579: chore(deps): bump futures from 0.1.28 to 0.1.29 r=zhangsoledad a=dependabot-preview[bot]

Bumps [futures](https://github.com/rust-lang-nursery/futures-rs) from 0.1.28 to 0.1.29.
<details>
<summary>Commits</summary>

- [`56f8eb9`](rust-lang/futures-rs@56f8eb9) 0.1.29 release
- [`ad7830d`](rust-lang/futures-rs@ad7830d) add must_use attributes on Future and Stream
- See full diff in [compare view](rust-lang/futures-rs@0.1.28...0.1.29)
</details>
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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>