build(deps): update rand_core requirement from 0.5.1 to 0.6.4

[dependabot[bot]]

Updates the requirements on rand_core to permit the latest version.

Changelog

Sourced from rand_core's changelog.

[0.6.4] - 2019-01-08

Fixes

• Move wasm-bindgen shims to correct crate (#686)
• Make wasm32-unknown-unknown compile but fail at run-time if missing bindingsg (#686)

[0.6.3] - 2019-01-04

Fixes

• Make the std feature require the optional rand_os dependency (#675)
• Re-export the optional WASM dependencies of rand_os from rand to avoid breakage (#674)

[0.6.2] - 2019-01-04

Additions

• Add Default for ThreadRng (#657)
• Move rngs::OsRng to rand_os sub-crate; clean up code; use as dependency (#643) ##BLOCKER##
• Add rand_xoshiro sub-crate, plus benchmarks (#642, #668)

Fixes

• Fix bias in UniformInt::sample_single (#662)
• Use autocfg instead of rustc_version for rustc version detection (#664)
• Disable i128 and u128 if the target_os is emscripten (#671: work-around Emscripten limitation)
• CI fixes (#660, #671)

Optimisations

• Optimise memory usage of UnitCircle and UnitSphereSurface distributions (no PR)

[0.6.1] - 2018-11-22

• Support sampling Duration also for no_std (only since Rust 1.25) (#649)
• Disable default features of libc (#647)

[0.6.0] - 2018-11-14

Project organisation

• Rand has moved from rust-lang-nursery to rust-random! (#578)
• Created The Rust Random Book (source)
• Update copyright and licence notices (#591, #611)
• Migrate policy documentation from the wiki (#544)

Platforms

• Add fork protection on Unix (#466)
• Added support for wasm-bindgen. (#541, #559, #562, #600)
• Enable OsRng for powerpc64, sparc and sparc64 (#609)
• Use syscall from libc on Linux instead of redefining it (#629)

RNGs

• Switch SmallRng to use PCG (#623)
• Implement Pcg32 and Pcg64Mcg generators (#632)
• Move ISAAC RNGs to a dedicated crate (#551)
• Move Xorshift RNG to its own crate (#557)

... (truncated)

Commits

• 89a1336 rand_core: update CHANGELOG for 0.6.4 (#1253)
• b736407 Merge pull request #1246 from rust-random/work6
• fbf06ff Optimized path of sample_efraimidis_spirakis is stable
• 6951164 Bump MSRV to 1.51.0: support const generics by default
• db80c40 Bump MSRV to 1.38.0: fixes crossbeam-utils dev-dependency
• 2569e9d Mention disabling getrandom for wasm32-unknown-unknown in README (#1250)
• 9dd97b4 Merge pull request #1247 from rust-random/TheIronBorn-patch-1
• d60ab38 optimize simd wmul
• 2c16a92 Merge pull request #1239 from TheIronBorn/std-simd
• 949d70f fix doc test
• Additional commits viewable in compare view

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