Bump num-bigint from 0.2.6 to 0.3.1

[dependabot[bot]]

Bumps num-bigint from 0.2.6 to 0.3.1.

Changelog

Sourced from num-bigint's changelog.

Release 0.3.1 (2020-11-03)

• Addition and subtraction now uses intrinsics for performance on x86 and x86_64 when built with Rust 1.33 or later.
• Conversions to_f32 and to_f64 now return infinity for very large numbers, rather than None. This does preserve the sign too, so a large negative BigInt will convert to negative infinity.
• The optional arbitrary feature implements arbitrary::Arbitrary, distinct from quickcheck::Arbitrary.
• The division algorithm has been optimized to reduce the number of temporary allocations and improve the internal guesses at each step.
• BigInt and BigUint will opportunistically shrink capacity if the internal vector is much larger than needed.

Contributors: @cuviper, @e00E, @ejmahler, @notoria, @tczajka

Release 0.3.0 (2020-06-12)

Enhancements

• [The internal BigDigit may now be either u32 or u64][62], although that implementation detail is not exposed in the API. For now, this is chosen to match the target pointer size, but may change in the future.
• [No-std is now supported with the alloc crate on Rust 1.36][101].
• [Pow is now implemented for bigint values][137], not just references.
• [TryFrom is now implemented on Rust 1.34 and later][123], converting signed integers to unsigned, and narrowing big integers to primitives.
• [Shl and Shr are now implemented for a variety of shift types][142].
• A new trailing_zeros() returns the number of consecutive zeros from the least significant bit.
• The new BigInt::magnitude and into_parts methods give access to its BigUint part as the magnitude.

Breaking Changes

• num-bigint now requires Rust 1.31 or greater.
  • The "i128" opt-in feature was removed, now always available.
• [Updated public dependences][110]:
  • rand support has been updated to 0.7, requiring Rust 1.32.
  • quickcheck support has been updated to 0.9, requiring Rust 1.34.
• [Removed impl Neg for BigUint][145], which only ever panicked.
• [Bit counts are now u64 instead of usize][143].

Contributors: @cuviper, @dignifiedquire, @hansihe,

... (truncated)

Commits

• 38d6973 Merge #173
• 456c3db Release 0.3.1
• b1c638e Make licensing more explicit
• a2ad16d Merge #166
• b3d48f4 Merge #141
• 6bd8c9c Remove fuzz example
• cf299cf Merge #170
• b03eb6d Improve performance of the basic division algorithm.
• e03bbc1 Restructure adc/sbb to match addcarry/subborrow
• e3971e6 Unify addcarry probing for x86_64/x86
• Additional commits viewable in compare view

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