Bump rand_core from 0.2.0-pre.0 to 0.6.3 in /src/tor/src/rust

[dependabot[bot]]

Bumps rand_core from 0.2.0-pre.0 to 0.6.3.

Changelog

Sourced from rand_core's changelog.

[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)
• Move ChaCha and HC128 RNGs to dedicated crates (#607, #636)
• Remove usage of Rc from ThreadRng (#615)

Sampling and distributions

• Implement Rng.gen_ratio() and Bernoulli::new_ratio() (#491)

... (truncated)

Commits

• 8792268 Merge pull request #1137 from rust-random/work2
• 1bfc53d Update changelogs and bump version numbers
• 4534311 Merge pull request #1133 from rust-random/work2
• 81f1af8 Correct usage of reserve
• fa17d1c Add comment to append_string for Standard
• b4c1d66 Add DistString
• 1947c89 Move Distribution trait and associates to sub-module
• 98a0339 Merge pull request #1135 from dhardy/work
• a7f8fb7 Prepare rand_chacha v0.3.1 release
• 09d3df3 Merge pull request #1130 from dhardy/work
• Additional commits viewable in compare view

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