Bump rand from 0.4.2 to 0.6.3

[dependabot-preview]

Bumps rand from 0.4.2 to 0.6.3.

Changelog

Sourced from rand'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

• ca96671 Merge pull request #676 from dhardy/master
• 88f36aa Bump version number and changelog
• ec58ff0 Re-export optional rand_os WASM dependencies as features, and make std re...
• ec634c3 Merge pull request #673 from dhardy/master
• cf5e07f Fix rand_xoshiro dependencies
• 3001e91 Merge pull request #672 from dhardy/master
• 3b7cf7a Prepare rand version 0.6.2 release
• 2448457 Add changelog notes for rand_pcg version 0.1.2 release
• 59f0b2f Prepare rand_os version 0.1.0 release; add copyright notices
• a819aea Prepare rand_xoshiro version 0.1.0 release; add copyright notices
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

Dependabot will not automatically merge this PR because this dependency is pre-1.0.0.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge
• @dependabot reopen will reopen this PR if it is closed
• @dependabot ignore this [patch|minor|major] version will close this PR and stop Dependabot creating any more for this minor/major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Automerge options (never/patch/minor, and dev/runtime dependencies)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

Finally, you can contact us by mentioning @dependabot.

[dependabot-preview]

Superseded by #18.