Merge #1026

1026: Bump smallvec from 0.6.13 to 1.0.0 r=MarkMcCaskey a=dependabot-preview[bot]

Bumps [smallvec](https://github.com/servo/rust-smallvec) from 0.6.13 to 1.0.0.
<details>
<summary>Release notes</summary>

*Sourced from [smallvec's releases](https://github.com/servo/rust-smallvec/releases).*

> ## v1.0.0
>  * Requires Rust 1.36 or later.
>  * [breaking change] Use `MaybeUninit` to avoid possible undefined behavior ([#162](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/162), [#170](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/170)).
>  * [breaking change] The `drain` method now takes a range argument, just like the standard `Vec::drain` ([#145](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/145)).
>  * [breaking change] Remove the `unreachable` function and replace it with the new standard `unreachable_unchecked` function ([#164](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/164)).
>  * [breaking change] Use `no_std` by default. This crate depends only on `core` and `alloc` by default. If the optional `write` feature is enabled then it depends on `std` so that `SmallVec<[u8;_]>` can implement the `std::io::Write` trait ([#173](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/173)).
>  * [breaking change] Remove the deprecated `VecLike` trait ([#165](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/165)).
>  * Add support for 96-element small vectors, `SmallVec<[T; 96]>` ([#163](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/163)).
>  * Iterators now implement `FusedIterator` ([#172](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/172)).
>  * Indexing now uses the standard `SliceIndex` trait ([#166](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/166)).
>  * Add automatic fuzz testing and MIRI testing ([#168](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/168), [#162](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/162)).
>  * Update syntax and formatting to Rust 2018 standard ([#174](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/174), [#167](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/167)).
> 
</details>
<details>
<summary>Commits</summary>

- [`34c2628`](servo/rust-smallvec@34c2628) Auto merge of [#175](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/175) - mbrubeck:one, r=jdm
- [`523a6dc`](servo/rust-smallvec@523a6dc) Version 1.0.0
- [`a2c0504`](servo/rust-smallvec@a2c0504) Auto merge of [#174](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/174) - mbrubeck:2018, r=jdm
- [`a51059c`](servo/rust-smallvec@a51059c) Update to Rust 2018 edition
- [`01917a6`](servo/rust-smallvec@01917a6) Auto merge of [#168](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/168) - dpc:fuzz, r=mbrubeck
- [`a3ba738`](servo/rust-smallvec@a3ba738) Add a fake stub input case for afl fuzzer
- [`85c54a5`](servo/rust-smallvec@85c54a5) Add simple fuzzing
- [`b2c9c65`](servo/rust-smallvec@b2c9c65) Auto merge of [#173](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/173) - mbrubeck:std, r=emilio
- [`fffb185`](servo/rust-smallvec@fffb185) Use no_std by default
- [`af73fbd`](servo/rust-smallvec@af73fbd) Auto merge of [#172](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/172) - mbrubeck:fused, r=mbrubeck
- Additional commits viewable in [compare view](servo/rust-smallvec@v0.6.13...v1.0.0)
</details>
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