Update rand requirement to 0.5

[dependabot-preview[bot]]

Updates the requirements on rand to permit the latest version.

Changelog

*Sourced from [rand's changelog](https://github.com/rust-lang-nursery/rand/blob/master/CHANGELOG.md).* > ## [0.5.3] - 2018-06-26 > ### Platform support > - OpenBSD, Bitrig: fix compilation (broken in 0.5.1) ([#530](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/530)) > > ## [0.5.2] - 2018-06-18 > ### Platform support > - Hide `OsRng` and `JitterRng` on unsupported platforms (#512; fixes [#503](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/503)). > > ## [0.5.1] - 2018-06-08 > > ### New distributions > - Added Cauchy distribution. ([#474](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/474), [#486](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/486)) > - Added Pareto distribution. ([#495](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/495)) > > ### Platform support and `OsRng` > - Remove blanket Unix implementation. ([#484](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/484)) > - Remove Wasm unimplemented stub. ([#484](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/484)) > - Dragonfly BSD: read from `/dev/random`. ([#484](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/484)) > - Bitrig: use `getentropy` like OpenBSD. ([#484](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/484)) > - Solaris: (untested) use `getrandom` if available, otherwise `/dev/random`. ([#484](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/484)) > - Emscripten, `stdweb`: split the read up in chunks. ([#484](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/484)) > - Emscripten, Haiku: don't do an extra blocking read from `/dev/random`. ([#484](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/484)) > - Linux, NetBSD, Solaris: read in blocking mode on first use in `fill_bytes`. ([#484](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/484)) > - Fuchsia, CloudABI: fix compilation (broken in Rand 0.5). ([#484](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/484)) > > ## [0.5.0] - 2018-05-21 > > ### Crate features and organisation > - Minimum Rust version update: 1.22.0. ([#239](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/239)) > - Create a separate `rand_core` crate. ([#288](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/288)) > - Deprecate `rand_derive`. ([#256](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/256)) > - Add `prelude` (and module reorganisation). ([#435](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/435)) > - Add `log` feature. Logging is now available in `JitterRng`, `OsRng`, `EntropyRng` and `ReseedingRng`. ([#246](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/246)) > - Add `serde1` feature for some PRNGs. ([#189](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/189)) > - `stdweb` feature for `OsRng` support on WASM via stdweb. ([#272](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/272), [#336](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/336)) > > ### `Rng` trait > - Split `Rng` in `RngCore` and `Rng` extension trait. > `next_u32`, `next_u64` and `fill_bytes` are now part of `RngCore`. ([#265](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/265)) > - Add `Rng::sample`. ([#256](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/256)) > - Deprecate `Rng::gen_weighted_bool`. ([#308](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/308)) > - Add `Rng::gen_bool`. ([#308](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/308)) > - Remove `Rng::next_f32` and `Rng::next_f64`. ([#273](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/273)) > - Add optimized `Rng::fill` and `Rng::try_fill` methods. ([#247](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/247)) > - Deprecate `Rng::gen_iter`. ([#286](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/286)) > - Deprecate `Rng::gen_ascii_chars`. ([#279](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/279)) > > ### `rand_core` crate > - `rand` now depends on new `rand_core` crate ([#288](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/288)) > - `RngCore` and `SeedableRng` are now part of `rand_core`. ([#288](https://github-redirect.dependabot.com/rust-lang-nursery/rand/issues/288)) > ... (truncated)

Commits

- See full diff in [compare view](https://github.com/rust-lang-nursery/rand/commits/0.5.3)

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[alexcrichton]

@dependabot merge

[dependabot-preview[bot]]

OK, I'll merge this once your CI passes on it.

[dependabot-preview[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.