Update strum_macros requirement from 0.21 to 0.22

[dependabot]

Updates the requirements on strum_macros to permit the latest version.

Changelog

Sourced from strum_macros's changelog.

0.22.0

• #180: Deprecates ToString derive. You should use Display instead.

• #178: Deprecates AsStaticStr. This has been undocumented for a while. The recommended method is to derive IntoStaticStr instead.

• #171: Improve no-std support.

• #170: enable changing the path to strum traits. This is necessary if you re-export strum as a submodule in another crate.

0.21.1

• #164 Improve compatibility with older versions of syn.

0.21.0

• Replace std:: with core:: to support no-std projects. #145

• Breaking Changes

  • MSRV is updated to 1.32 because heck does not work in 1.31.1 anymore. Rust 1.32 came out Jan 2019 so hopefully teams have moved to an equal or newer version.
  • #149 Remove the "rename" feature. In Rust 2018, macros should be imported using a qualified path to avoid collisions. strum_macros::EnumString rather than using the "Rename" feature to avoid collisions.
  • #160 enum messages: Make the returned values all 'static
    • It is unlikely this will break anyone, but the new signature for functions generated by EnumMessage is fn get_message(&self) -> Option<&'static str>.

• Added support for ascii_case_insensitive string comparisons. #157 This feature allows FromString impls to match strings that differ in case from the expected variant.

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

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[dependabot]

Superseded by #22.