Update rand_core requirement from 0.4.0 to 0.5.1

[dependabot-preview]

Updates the requirements on rand_core to permit the latest version.

Changelog

Sourced from rand_core's changelog.

[0.5.1] - 2018-06-08

New distributions

• Added Cauchy distribution. (#474, #486)
• Added Pareto distribution. (#495)

Platform support and OsRng

• Remove blanket Unix implementation. (#484)
• Remove Wasm unimplemented stub. (#484)
• Dragonfly BSD: read from /dev/random. (#484)
• Bitrig: use getentropy like OpenBSD. (#484)
• Solaris: (untested) use getrandom if available, otherwise /dev/random. (#484)
• Emscripten, stdweb: split the read up in chunks. (#484)
• Emscripten, Haiku: don't do an extra blocking read from /dev/random. (#484)
• Linux, NetBSD, Solaris: read in blocking mode on first use in fill_bytes. (#484)
• Fuchsia, CloudABI: fix compilation (broken in Rand 0.5). (#484)

[0.5.0] - 2018-05-21

Crate features and organisation

• Minimum Rust version update: 1.22.0. (#239)
• Create a separate rand_core crate. (#288)
• Deprecate rand_derive. (#256)
• Add prelude (and module reorganisation). (#435)
• Add log feature. Logging is now available in JitterRng, OsRng, EntropyRng and ReseedingRng. (#246)
• Add serde1 feature for some PRNGs. (#189)
• stdweb feature for OsRng support on WASM via stdweb. (#272, #336)

Rng trait

• Split Rng in RngCore and Rng extension trait.
  next_u32, next_u64 and fill_bytes are now part of RngCore. (#265)
• Add Rng::sample. (#256)
• Deprecate Rng::gen_weighted_bool. (#308)
• Add Rng::gen_bool. (#308)
• Remove Rng::next_f32 and Rng::next_f64. (#273)
• Add optimized Rng::fill and Rng::try_fill methods. (#247)
• Deprecate Rng::gen_iter. (#286)
• Deprecate Rng::gen_ascii_chars. (#279)

rand_core crate

• rand now depends on new rand_core crate (#288)
• RngCore and SeedableRng are now part of rand_core. (#288)
• Add modules to help implementing RNGs impl and le. (#209, #228)
• Add Error and ErrorKind. (#225)
• Add CryptoRng marker trait. (#273)
• Add BlockRngCore trait. (#281)
• Add BlockRng and BlockRng64 wrappers to help implementations. (#281, #325)
• Revise the SeedableRng trait. (#233)
• Remove default implementations for RngCore::next_u64 and RngCore::fill_bytes. (#288)

... (truncated)

Commits

• d877ed5 Merge pull request #864 from dhardy/error
• 3b79aaa Merge branch 'master' into error
• a4cd495 Merge pull request #856 from taiki-e/alloc
• 918765d Apply requested changes
• 3b038a5 Remove #![feature(alloc)]
• df0c772 Reconstruct io::Error from raw code if possible in From impl
• 2f9e9b2 Update rand_core and rand_jitter versions
• 73251d5 Update rand_core::Error in line with getrandom::Error
• 18ce640 Merge pull request #863 from dhardy/osrng
• 8616945 Merge pull request #866 from vks/update-weights
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #105.