Merge amethyst#135

135: Update hashbrown requirement from 0.2.0 to 0.3.0 r=torkleyy a=dependabot[bot]

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

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

> ## [v0.3.0] - 2019-04-23
> 
> ### Changed
> - Changed shrink_to to not panic if min_capacity < capacity. ([amethyst#67](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/67))
> 
> ### Fixed
> - Worked around emscripten bug emscripten-core/emscripten-fastcomp#258. ([amethyst#66](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/66))
> 
> ## [v0.2.2] - 2019-04-16
> 
> ### Fixed
> - Inlined non-nightly lowest_set_bit_nonzero. ([amethyst#64](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/64))
> - Fixed build on latest nightly. ([amethyst#65](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/65))
> 
> ## [v0.2.1] - 2019-04-14
> 
> ### Changed
> - Use for_each in map Extend and FromIterator. ([amethyst#58](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/58))
> - Improved worst-case performance of HashSet.is_subset. ([amethyst#61](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/61))
> 
> ### Fixed
> - Removed incorrect debug_assert. ([amethyst#60](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/60))
> 
> ## [v0.2.0] - 2019-03-31
> 
> ### Changed
> - The code has been updated to Rust 2018 edition. This means that the minimum
>   Rust version has been bumped to 1.31 (2018 edition).
> 
> ### Added
> - Added `insert_with_hasher` to the raw_entry API to allow `K: !(Hash + Eq)`. ([amethyst#54](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/54))
> - Added support for using hashbrown as the hash table implementation in libstd. ([amethyst#46](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/46))
> 
> ### Fixed
> - Fixed cargo build with minimal-versions. ([amethyst#45](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/45))
> - Fixed `#[may_dangle]` attributes to match the libstd `HashMap`. ([amethyst#46](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/46))
> - ZST keys and values are now handled properly. ([amethyst#46](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/46))
> 
> ## [v0.1.8] - 2019-01-14
> 
> ### Added
> - Rayon parallel iterator support ([amethyst#37](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/37))
> - `raw_entry` support ([amethyst#31](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/31))
> - `#[may_dangle]` on nightly ([amethyst#31](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/31))
> - `try_reserve` support ([amethyst#31](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/31))
> 
> ### Fixed
> - Fixed variance on `IterMut`. ([amethyst#31](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/31))
> 
> ## [v0.1.7] - 2018-12-05
></tr></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`7e79b0c`](Amanieu/hashbrown@7e79b0c) Version 0.3.0
- [`7e2da14`](Amanieu/hashbrown@7e2da14) Merge [amethyst#67](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/67)
- [`8ec72d0`](Amanieu/hashbrown@8ec72d0) Change shrink_to to not panic if min_capacity < capacity
- [`ddf59a9`](Amanieu/hashbrown@ddf59a9) Merge [amethyst#66](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/66)
- [`6eddbe4`](Amanieu/hashbrown@6eddbe4) Work around emscripten bug emscripten-core/emscripten-fastcomp#258
- [`7dbd666`](Amanieu/hashbrown@7dbd666) Version 0.2.2
- [`12e8bb9`](Amanieu/hashbrown@12e8bb9) Merge [amethyst#64](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/64)
- [`a657af5`](Amanieu/hashbrown@a657af5) Merge [amethyst#65](https://github-redirect.dependabot.com/Amanieu/hashbrown/issues/65)
- [`373a9d4`](Amanieu/hashbrown@373a9d4) Fix warning on latest nightly
- [`79c5b41`](Amanieu/hashbrown@79c5b41) Inline non-nightly lowest_set_bit_nonzero
- Additional commits viewable in [compare view](Amanieu/hashbrown@v0.2.0...v0.3.0)
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Cargo.toml

@@ -20,7 +20,7 @@ travis-ci = { repository = "torkleyy/shred" }
 
 [dependencies]
 arrayvec = "0.4"
-hashbrown = "0.2.0"
+hashbrown = "0.3.0"
 mopa = "0.2"
 rayon = { version = "1.0", optional = true }
 smallvec = "0.6"