Bump rand_core from 0.3.0 to 0.3.1 in /http-requests/rust

[dependabot[bot]]

Bumps rand_core from 0.3.0 to 0.3.1.

Changelog

Sourced from rand_core's changelog.

[0.3.19] - 2017-12-27

Changed

• Require log <= 0.3.8 for dev builds
• Update fuchsia-zircon dependency to 0.3
• Fix broken links in docs (to unblock compiler docs testing CI)

[0.3.18] - 2017-11-06

Changed

• thread_rng is seeded from the system time if OsRng fails
• weak_rng now uses thread_rng internally

[0.3.17] - 2017-10-07

Changed

• Fuchsia: Magenta was renamed Zircon

[0.3.16] - 2017-07-27

Added

• Implement Debug for mote non-public types
• implement Rand for (i|u)i128
• Support for Fuchsia

Changed

• Add inline attribute to SampleRange::construct_range. This improves the benchmark for sample in 11% and for shuffle in 16%.
• Use RtlGenRandom instead of CryptGenRandom

[0.3.15] - 2016-11-26

Added

• Add Rng trait method choose_mut
• Redox support

Changed

• Use arc4rand for OsRng on FreeBSD.
• Use arc4random(3) for OsRng on OpenBSD.

Fixed

• Fix filling buffers 4 GiB or larger with OsRng::fill_bytes on Windows

[0.3.14] - 2016-02-13

Fixed

• Inline definitions from winapi/advapi32, which decreases build times

[0.3.13] - 2016-01-09

Fixed

• Compatible with Rust 1.7.0-nightly (needed some extra type annotations)

... (truncated)

Commits

• 3684cc9 Update version number of rand_core to 0.3.1
• 54b535a Replace rand_core 0.3 with shim around version 0.4
• 6f3875f Merge pull request #696 from stevebob/wasm-bindgen-test
• ff5a700 Remove unnecessary duplication in travis config
• 13dafd9 Re-add wasm-bindgen-test tests
• a2ffbf5 Merge remote-tracking branch 'upstream/master' into wasm-bindgen-test
• b09f92a Merge pull request #685 from newpavlov/jitter
• d3b3d47 Merge pull request #698 from fitzgen/fix-wasm-bindgen-imports
• b18df42 Fix wasm32_bindgen implementation
• 1fbcb45 Correct wasm-bindgen-cli package name in travis config
• Additional commits viewable in compare view

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