Bump rand from 0.7.3 to 0.8.0

[dependabot-preview]

Bumps rand from 0.7.3 to 0.8.0.

Changelog

Sourced from [rand's changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md).

[0.8.0] - 2020-12-18

Platform support

• The minimum supported Rust version is now 1.36 ([Add RFC for bounded recursion. #1011](https://github-redirect.dependabot.com/Bump MSRV to 1.36 rust-random/rand#1011))
• getrandom updated to v0.2 ([[Bug] Invalid input values causes rust panic #1041](https://github-redirect.dependabot.com/Update getrandom to 0.2 rust-random/rand#1041))
• Remove wasm-bindgen and stdweb feature flags. For details of WASM support, see the [getrandom documentation](https://docs.rs/getrandom/latest). ([[Feature] Char + String Static Circuit Methods #948](https://github-redirect.dependabot.com/Add std_rng feature, remove deprecations rust-random/rand#948))
• ReadRng::next_u32 and next_u64 now use little-Endian conversion instead of native-Endian, affecting results on Big-Endian platforms ([[Bug] calling mutable method after directly indexing value causes mutability error #1061](https://github-redirect.dependabot.com/Fix next_u64_via_fill; rand_core changelog rust-random/rand#1061))
• The nightly feature no longer implies the simd_support feature ([quick pr to fix merge conflicts #1048](https://github-redirect.dependabot.com/Disentangle nightly and simd_support feature rust-random/rand#1048))
• Fix simd_support feature to work on current nightlies ([[RFC] Add initial RFC for type casts. #1056](https://github-redirect.dependabot.com/Fix "simd_support" feature rust-random/rand#1056))

Rngs

• ThreadRng is no longer Copy to enable safe usage within thread-local destructors ([[Bug] comparing strings during mutation causes strings do not exist on ASG level #1035](https://github-redirect.dependabot.com/ThreadRng: fix use-after-free in TL-dtor; doc for sized iterators rust-random/rand#1035))
• gen_range(a, b) was replaced with gen_range(a..b). gen_range(a..=b) is also supported. Note that a and b can no longer be references or SIMD types. ([Bump indexmap from 1.6.1 to 1.6.2 #744](https://github-redirect.dependabot.com/gen_range doesn't take a Range rust-random/rand#744), [Bump snarkvm-curves from 0.3.1 to 0.5.1 #1003](https://github-redirect.dependabot.com/gen_range(a, b) -> gen_range(a..b) and gen_range(a..=b) rust-random/rand#1003))
• Replace AsByteSliceMut with Fill and add support for [bool], [char], [f32], [f64] ([[Feature] Char Parsing #940](https://github-redirect.dependabot.com/Replace AsByteSliceMut with Fill rust-random/rand#940))
• Restrict rand::rngs::adapter to std ([fix slice assignment for strings #1027](https://github-redirect.dependabot.com/Restrict rand::rngs::adapter to std rust-random/rand#1027); see also [Strings RFC updates #928](https://github-redirect.dependabot.com/Make libc dependency optional rust-random/rand#928))
• StdRng: add new std_rng feature flag (enabled by default, but might need to be used if disabling default crate features) ([[Feature] Char + String Static Circuit Methods #948](https://github-redirect.dependabot.com/Add std_rng feature, remove deprecations rust-random/rand#948))
• StdRng: Switch from ChaCha20 to ChaCha12 for better performance ([Update 002-bounded-recursion.md #1028](https://github-redirect.dependabot.com/StdRng: Switch to ChaCha12 rust-random/rand#1028))
• SmallRng: Replace PCG algorithm with xoshiro{128,256}++ ([Bump rand_core from 0.6.2 to 0.6.3 #1038](https://github-redirect.dependabot.com/ SmallRng: Replace PCG algorithm with xoshiro{128,256}++ rust-random/rand#1038))

Sequences

• Add IteratorRandom::choose_stable as an alternative to choose which does not depend on size hints ([[Feature] Write RFC for type casts. #1057](https://github-redirect.dependabot.com/Add Iterator::choose_stable() rust-random/rand#1057))
• Improve accuracy and performance of IteratorRandom::choose ([Fixes tuple access #1059](https://github-redirect.dependabot.com/fix accuracy of IteratorRandom::choose() rust-random/rand#1059))
• Implement IntoIterator for IndexVec, replacing the into_iter method ([Dynamic array index assignment #1007](https://github-redirect.dependabot.com/Fix most clippy lints rust-random/rand#1007))
• Add value stability tests for seq module ([[Proposal] Optimize const pow operation into inline multiplication #933](https://github-redirect.dependabot.com/Value stability tests for seq functionalty rust-random/rand#933))

Misc

• Support PartialEq and Eq for StdRng, SmallRng and StepRng ([Feature/string canonicalization #979](https://github-redirect.dependabot.com/impl PartialEq, Eq for rngs rust-random/rand#979))
• Added a serde1 feature and added Serialize/Deserialize to UniformInt and WeightedIndex ([[Feature] String parsing #974](https://github-redirect.dependabot.com/Added serde1 feature to Serialize/Deserialize WeightedIndex rust-random/rand#974))
• Drop some unsafe code ([[Epic] PFCS/R1CS Design and Implementation #962](https://github-redirect.dependabot.com/Drop unsafe code from SeedableRng::seed_from_u64 rust-random/rand#962), [Bump notify from 4.0.16 to 4.0.17 #963](https://github-redirect.dependabot.com/Drop unsafe code from next_u64 rust-random/rand#963), [Add RFC for bounded recursion. #1011](https://github-redirect.dependabot.com/Bump MSRV to 1.36 rust-random/rand#1011))
• Reduce packaged crate size ([Update 001-initial-strings.md #983](https://github-redirect.dependabot.com/Reduce packaged crate size by 5kb using cargo diet -r rust-random/rand#983))
• Migrate to GitHub Actions from Travis+AppVeyor ([Update to snarkvm 0.6.0 #1073](https://github-redirect.dependabot.com/Migrate to GitHub Actions rust-random/rand#1073))

Distributions

• Alphanumeric samples bytes instead of chars ([[Bug] cannot assign to non-const array index #935](https://github-redirect.dependabot.com/Impl Distribution<u8> for Alphanumeric rust-random/rand#935))
• Uniform now supports char, enabling rng.gen_range('A'..='Z') ([Bump snarkvm-utilities from 0.5.5 to 0.6.0 #1068](https://github-redirect.dependabot.com/Implement SampleUniform for char rust-random/rand#1068))
• Add UniformSampler::sample_single_inclusive ([Bump snarkvm-curves from 0.3.1 to 0.5.1 #1003](https://github-redirect.dependabot.com/gen_range(a, b) -> gen_range(a..b) and gen_range(a..=b) rust-random/rand#1003))

Weighted sampling

• Implement weighted sampling without replacement ([[Feature] More Char Operators #976](https://github-redirect.dependabot.com/Add SliceRandom::choose_multiple_weighted, implementing weighted sampling without replacement rust-random/rand#976), [Bump snarkvm-fields from 0.3.1 to 0.5.2 #1013](https://github-redirect.dependabot.com/Re: weighted sampling without replacement  rust-random/rand#1013))
• rand::distributions::alias_method::WeightedIndex was moved to rand_distr::WeightedAliasIndex. The simpler alternative rand::distribution::WeightedIndex remains. ([[Feature] String Reducers + Canonicalization #945](https://github-redirect.dependabot.com/Move Alias-method WeightedIndex to rand_distr rust-random/rand#945))
• Improve treatment of rounding errors in WeightedIndex::update_weights ([Bump assert_cmd from 1.0.3 to 1.0.4 #956](https://github-redirect.dependabot.com/Rounding error fix on WeightedIndex::update_weights() rust-random/rand#956))
• WeightedIndex: return error on NaN instead of panic ([Bump snarkvm-r1cs from 0.3.1 to 0.5.1 #1005](https://github-redirect.dependabot.com/Handle NaN in WeightedIndex with error instead of panic rust-random/rand#1005))

Documentation

• Document types supported by random ([[Bug] single digit unicode char causes panic #994](https://github-redirect.dependabot.com/Update random() documentation rust-random/rand#994))

Commits

• 98a1aaf Merge pull request [[Bug] using input when indexing slice causes failed to parse #1076](https://github-redirect.dependabot.com/Rand v0.8, rand_distr v0.4 rust-random/rand#1076) from dhardy/work
• 46082d5 Fix installation of multilib
• d109f18 Update changelog for rand v0.8
• cc93dae Merge pull request [[Bug] indexing nested value from slice during mutation causes failed to select #1079](https://github-redirect.dependabot.com/Modified the StdRng documentation rust-random/rand#1079) from JJPennington/master
• 9aa8bc1 Modified the StdRng documentation
• 34423a6 Use cp to create redirect
• d4b180d Merge pull request [[Bug] possible accidental text getting printed to stdout #1078](https://github-redirect.dependabot.com/Fix doc links rust-random/rand#1078) from rust-random/work2
• 1959b1a Adjust homepage to point at the book
• e9adf45 Switch documentation links to docs.rs
• da3458b Add HTML redirect
• Additional commits viewable in [compare view](https://github.com/rust-random/rand/compare/0.7.3...0.8.0)

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[dependabot-preview]

Superseded by #523.