Update strum requirement from 0.20 to 0.21

[dependabot[bot]]

Updates the requirements on strum to permit the latest version.

Changelog

Sourced from strum's changelog.

Changelog

0.20.0

• Refactors to do better error handling. Thanks @​jplatte for these changes

  • #133
  • #134
  • #135

• Adding vis(scope) to EnumDiscriminants. #137

  • This feature works best with versions of rust >= 1.34 due to a rustc parsing error in earlier versions.
  • Earlier versions can still use vis(r#pub)

• These changes should not be breaking, but the amount of code modified was significant.

• FYI about #122. The macro renames feature will be removed in early 2021. This feature was only necessary in rust 2015 because macros didn't support qualified imports so macro names could collide between crates.

0.19.4 / 0.19.5

• Updated docs

0.19.3

• Properly error on malformed strum attributes. #119
  • These types of inputs have historically been ignore silently. This may break code that is already incorrect.
• Move docs back to rust docs. #121
• Updated the docs a second time to improve discoverability.

0.19.2

• Fixes #104. PR #105

0.19.1

• Breaking Change: EnumVariantNames now properly adjusts to the to_string and serialize attributes.
• There's a regression in this release that may make strum imcompatible with other plugins if those plugins use non-rust syntax in their attributes. #104

0.19.0

• Fixed a regression using nth_back. #85
• Added repository to Cargo.toml. #90
• Correctly handle fill align in Display impls. #95
• Breaking Change: Use Associated Constant for EnumCount instead of const fn and free constant. #99 This behavior is consistent with the other derives.
• Breaking Change. default and disabled should now be written as markers instead of key value pairs.

... (truncated)

Commits

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