Merge #16

16: Update crossbeam-epoch requirement from 0.7.0 to 0.8.0 r=bossmc a=dependabot-preview[bot]

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

*Sourced from [crossbeam-epoch's changelog](https://github.com/crossbeam-rs/crossbeam/blob/master/CHANGELOG.md).*

> # Version 0.7.3
> 
> - Fix breakage with nightly feature due to [rust-lang/rust#65214](https://github-redirect.dependabot.com/rust-lang/rust/issues/65214).
> - Bump `crossbeam-channel` to `0.4`.
> - Bump `crossbeam-epoch` to `0.8`.
> - Bump `crossbeam-queue` to `0.2`.
> - Bump `crossbeam-utils` to `0.7`.
> 
> # Version 0.7.2
> 
> - Bump `crossbeam-channel` to `0.3.9`.
> - Bump `crossbeam-epoch` to `0.7.2`.
> - Bump `crossbeam-utils` to `0.6.6`.
> 
> # Version 0.7.1
> 
> - Bump `crossbeam-utils` to `0.6.5`.
> 
> # Version 0.7.0
> 
> - Remove `ArcCell`, `MsQueue`, and `TreiberStack`.
> - Change the interface of `ShardedLock` to match `RwLock`.
> - Add `SegQueue::len()`.
> - Rename `SegQueue::try_pop()` to `SegQueue::pop()`.
> - Change the return type of `SegQueue::pop()` to `Result`.
> - Introduce `ArrayQueue`.
> - Update dependencies.
> 
> # Version 0.6.0
> 
> - Update dependencies.
> 
> # Version 0.5.0
> 
> - Update `crossbeam-channel` to 0.3.
> - Update `crossbeam-utils` to 0.6.
> - Add `AtomicCell`, `SharedLock`, and `WaitGroup`.
> 
> # Version 0.4.1
> 
> - Fix a double-free bug in `MsQueue` and `SegQueue`.
> 
> # Version 0.4
> 
> - Switch to the new implementation of epoch-based reclamation in
>   [`crossbeam-epoch`](https://github.com/crossbeam-rs/crossbeam-epoch), fixing numerous bugs in the
>   old implementation.  Its API is changed in a backward-incompatible way.
> - Switch to the new implementation of `CachePadded` and scoped thread in
>   [`crossbeam-utils`](https://github.com/crossbeam-rs/crossbeam-utils).  The scoped thread API is
>   changed in a backward-incompatible way.
></tr></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`28ad2b7`](crossbeam-rs/crossbeam@28ad2b7) Update versions in readmes
- [`c98fea1`](crossbeam-rs/crossbeam@c98fea1) Merge [#444](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/444)
- [`d953f49`](crossbeam-rs/crossbeam@d953f49) Add compatibility section to readme
- [`c76f145`](crossbeam-rs/crossbeam@c76f145) Prepare for the next release
- [`99762ee`](crossbeam-rs/crossbeam@99762ee) Merge [#442](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/442)
- [`ebb6b5f`](crossbeam-rs/crossbeam@ebb6b5f) Do not perform superfluous bounds checks on drop
- [`d2ab7a5`](crossbeam-rs/crossbeam@d2ab7a5) Update LICENSE-APACHE
- [`f54db88`](crossbeam-rs/crossbeam@f54db88) Merge [#437](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/437)
- [`caa52c4`](crossbeam-rs/crossbeam@caa52c4) Merge [#436](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/436)
- [`af68803`](crossbeam-rs/crossbeam@af68803) Merge [#438](https://github-redirect.dependabot.com/crossbeam-rs/crossbeam/issues/438)
- Additional commits viewable in [compare view](crossbeam-rs/crossbeam@crossbeam-epoch-0.7.0...crossbeam-epoch-0.8.0)
</details>
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Cargo.toml

@@ -17,7 +17,7 @@ version = "2.0.1"
 repository = "bossmc/pinboard"
 
 [dependencies]
-crossbeam-epoch = "0.7.0"
+crossbeam-epoch = "0.8.0"
 
 [dev-dependencies]
 crossbeam = "0.7.1"