Auto merge of rust-lang#1292 - rust-lang:dependabot/cargo/serde_deriv…

…e-1.0.87, r=Xanewok

Bump serde_derive from 1.0.85 to 1.0.87

Bumps [serde_derive](https://github.com/serde-rs/serde) from 1.0.85 to 1.0.87.
<details>
<summary>Release notes</summary>

*Sourced from [serde_derive's releases](https://github.com/serde-rs/serde/releases).*

> ## v1.0.87
> - Fix inclusion of tag in struct containing flattened fields ([rust-lang#1468](https://github-redirect.dependabot.com/serde-rs/serde/issues/1468), thanks [**jwillbold**](https://github.com/jwillbold))
>
> ## v1.0.86
> - Implement Serialize and Deserialize for core::ops::Bound\<T\> ([rust-lang#1466](https://github-redirect.dependabot.com/serde-rs/serde/issues/1466), thanks [**0nkery**](https://github.com/0nkery))
</details>
<details>
<summary>Commits</summary>

- [`134f268`](serde-rs/serde@134f268) Release 1.0.87
- [`c473633`](serde-rs/serde@c473633) Format with rustfmt 2018-12-10
- [`6a3a820`](serde-rs/serde@6a3a820) Merge pull request [rust-lang#1474](https://github-redirect.dependabot.com/serde-rs/serde/issues/1474) from jwillbold/master
- [`1d6ef76`](serde-rs/serde@1d6ef76) Fixed [rust-lang#1468](https://github-redirect.dependabot.com/serde-rs/serde/issues/1468), flattened struct fields made structs ignore their tag
- [`c8e3959`](serde-rs/serde@c8e3959) Release 1.0.86
- [`796f412`](serde-rs/serde@796f412) Document that Bound<T> impls exist
- [`fa854a2`](serde-rs/serde@fa854a2) Format with rustfmt 2018-12-10
- [`3a097ff`](serde-rs/serde@3a097ff) Deserialize Bound::Unbounded as unit variant
- [`8463bfc`](serde-rs/serde@8463bfc) Remove as yet unrequested range impls
- [`7a72b4c`](serde-rs/serde@7a72b4c) Merge pull request [rust-lang#1466](https://github-redirect.dependabot.com/serde-rs/serde/issues/1466) from 0nkery/master
- Additional commits viewable in [compare view](serde-rs/serde@v1.0.85...v1.0.87)
</details>
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