Update num requirement from ^0.2 to ^0.3

[dependabot-preview]

Updates the requirements on num to permit the latest version.

Changelog

Sourced from num's changelog.

Release 0.3.0 (2020-06-13)

All items exported from num-integer, num-iter, and num-traits are still semver-compatible with those exported by num 0.1 and 0.2. If you have these as public dependencies in your own crates, it is not a breaking change to move to num 0.3. However, this is not true of num-bigint, num-complex, or num-rational, as those exported items are distinct in this release.

Enhancements

• Updates to num-integer, num-iter, and num-traits are still compatible with num 0.1 and 0.2.
• The "alloc" feature enables bigint without std on Rust 1.36+.
• The "libm" feature enables Float without std in traits and complex.
• Please see the release notes of the individual sub-crates for details.

Breaking Changes

• num now requires rustc 1.31 or greater.
  • The "i128" opt-in feature was removed, now always available.
• rand support has been updated to 0.7, requiring Rust 1.32.

Contributors: @cuviper

Release 0.2.1 (2019-01-09)

• Updated all sub-crates to their latest versions.

Contributors: @cuviper, @ignatenkobrain, @jimbo1qaz

Release 0.2.0 (2018-06-29)

All items exported from num-integer, num-iter, and num-traits are still semver-compatible with those exported by num 0.1. If you have these as public dependencies in your own crates, it is not a breaking change to move to num 0.2. However, this is not true of num-bigint, num-complex, or num-rational, as those exported items are distinct in this release.

A few common changes are listed below, but most of the development happens in the individual sub-crates. Please consult their release notes for more details about recent changes: num-bigint, num-complex, num-integer, num-iter, num-rational, and num-traits.

Enhancements

... (truncated)

Commits

• e644f82 Merge #392
• bef0050 Release 0.3.0
• 4a6873b Merge #389
• ae0e8e3 Switch CI to GitHub Actions
• 111734b Merge #385
• 71b674a Add a libm feature for Float
• 5d6f64d Merge #384
• dc66fd6 Distinguish alloc/no_std in CI
• 0674699 Fix the doctest for 1.31
• 17ade44 Raise the MSRV to 1.31 and update CI
• Additional commits viewable in compare view

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