Merge amethyst#153

153: Update hashbrown requirement from 0.5.0 to 0.6.0 r=torkleyy a=dependabot-preview[bot]

Updates the requirements on [hashbrown](https://github.com/rust-lang/hashbrown) to permit the latest version.
<details>
<summary>Changelog</summary>

*Sourced from [hashbrown's changelog](https://github.com/rust-lang/hashbrown/blob/master/CHANGELOG.md).*

> ## [v0.6.0] - 2019-08-13
> 
> ### Fixed
> - Fixed AHash accidentally depending on `std`. ([amethyst#110](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/110))
> 
> ### Changed
> - The minimum Rust version has been bumped to 1.32 (due to `rand` dependency).
> 
> ## ~~[v0.5.1] - 2019-08-04~~
> 
> This release was _yanked_ due to a breaking change for users of `no-default-features`.
> 
> ### Added
> - The experimental and unsafe `RawTable` API is available under the "raw" feature. ([amethyst#108](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/108))
> - Added entry-like methods for `HashSet`. ([amethyst#98](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/98))
> 
> ### Changed
> - Changed the default hasher from FxHash to AHash. ([amethyst#97](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/97))
> - `hashbrown` is now fully `no_std` on recent Rust versions (1.36+). ([amethyst#96](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/96))
> 
> ### Fixed
> - We now avoid growing the table during insertions when it wasn't necessary. ([amethyst#106](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/106))
> - `RawOccupiedEntryMut` now properly implements `Send` and `Sync`. ([amethyst#100](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/100))
> - Relaxed `lazy_static` version. ([amethyst#92](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/92))
> 
> ## [v0.5.0] - 2019-06-12
> 
> ### Fixed
> - Resize with a more conservative amount of space after deletions. ([amethyst#86](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/86))
> 
> ### Changed
> - Exposed the Layout of the failed allocation in CollectionAllocErr::AllocErr. ([amethyst#89](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/89))
> 
> ## [v0.4.0] - 2019-05-30
> 
> ### Fixed
> - Fixed `Send` trait bounds on `IterMut` not matching the libstd one. ([amethyst#82](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/82))
> 
> ## [v0.3.1] - 2019-05-30
> 
> ### Fixed
> - Fixed incorrect use of slice in unsafe code. ([amethyst#80](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/80))
> 
> ## [v0.3.0] - 2019-04-23
> 
> ### Changed
> - Changed shrink_to to not panic if min_capacity < capacity. ([amethyst#67](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/67))
> 
> ### Fixed
> - Worked around emscripten bug emscripten-core/emscripten-fastcomp#258. ([amethyst#66](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/66))
></tr></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`0a62c3e`](rust-lang/hashbrown@0a62c3e) Version 0.6.0
- [`0c1209a`](rust-lang/hashbrown@0c1209a) Auto merge of [amethyst#110](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/110) - Amanieu:no_std_ci, r=Amanieu
- [`8ae33c9`](rust-lang/hashbrown@8ae33c9) Don't use cross for thumb target CI
- [`3239c2b`](rust-lang/hashbrown@3239c2b) Fix clippy warnings
- [`12c55b6`](rust-lang/hashbrown@12c55b6) Bump minimum Rust version to 1.32
- [`fb0a938`](rust-lang/hashbrown@fb0a938) Bump minimum ahash version to 0.2.11
- [`bacb169`](rust-lang/hashbrown@bacb169) Merge pull request [amethyst#111](https://github-redirect.dependabot.com/rust-lang/hashbrown/issues/111) from RalfJung/readme
- [`2921920`](rust-lang/hashbrown@2921920) when hashers with different design goals are compared, that should be noted
- [`aecb361`](rust-lang/hashbrown@aecb361) Check in CI that the crate builds on targets without libstd
- [`167eb54`](rust-lang/hashbrown@167eb54) Version 0.5.1
- Additional commits viewable in [compare view](rust-lang/hashbrown@v0.5.0...v0.6.0)
</details>
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Cargo.toml

@@ -20,7 +20,7 @@ travis-ci = { repository = "slide-rs/shred" }
 
 [dependencies]
 arrayvec = "0.4"
-hashbrown = "0.5.0"
+hashbrown = "0.6.0"
 mopa = "0.2"
 rayon = { version = "1.1", optional = true }
 shred-derive = { path = "shred-derive", version = "0.6.0", optional = true }