Update frunk_core requirement from 0.3.0 to 0.4.0

[dependabot[bot]]

Updates the requirements on frunk_core to permit the latest version.

Release notes

Sourced from frunk_core's releases.

0.4.0 release

Lots of good stuff thanks to team work from a number of contributors (incl @​mbrobbel, @​ImmemorConsultrixContrarie , @​ExpHP)

From the Changelog

• [Breaking change] Rename Hlist! type macro to HList! (lloydmeta/frunk#132)
• [Breaking change] Remove deprecated HList.length() (lloydmeta/frunk#125)
• [Breaking change] HFoldRightable rework: now HFoldRightable::foldr does not differ from HFoldLeftable::foldl in calling, like std::iter::DoubleEndedIterator::rfold does not differ from std::iter::Iterator::fold. Note: though foldr behavior wasn't changed, all old foldr calls would either stop compiling or produce wrong results (lloydmeta/frunk#171)
• [Breaking change] Bump quote, syn and proc-macro2 to 1 (lloydmeta/frunk#183)
• Fix unicode identifiers support lloydmeta/frunk#186

Changelog

Sourced from frunk_core's changelog.

[0.4.0]:

• [Breaking change] Rename Hlist! type macro to HList! (lloydmeta/frunk#132)
• [Breaking change] Remove deprecated HList.length() (lloydmeta/frunk#125)
• [Breaking change] HFoldRightable rework: now HFoldRightable::foldr does not differ from HFoldLeftable::foldl in calling, like std::iter::DoubleEndedIterator::rfold does not differ from std::iter::Iterator::fold. Note: though foldr behavior wasn't changed, all old foldr calls would either stop compiling or produce wrong results (lloydmeta/frunk#171)
• [Breaking change] Bump quote, syn and proc-macro2 to 1 (lloydmeta/frunk#183)
• Fix unicode identifiers support lloydmeta/frunk#186

[0.3.2] - 2021-04-16

• Allow folding hlist with a single Poly (lloydmeta/frunk#170)

[0.3.1] - 2019-12-21

• Refactoring derives (lloydmeta/frunk#157)
• Add support for deriving LabelledGeneric on enums (lloydmeta/frunk#158)
• Added HZippable (lloydmeta/frunk#160)
• Add a type macro for paths (lloydmeta/frunk#161)

[0.3.0] - 2019-03-23

Added

• More transmogrifications supported out of the box (lloydmeta/frunk#152)
  • Box, Option, Vec and more.
• More idiomatic Debug impl for Field Debug impls should use DebugStruct #153
• [no-std] support lloydmeta/frunk#148
  • Note: this is a breaking change, see the PR for details

[0.2.4] - 2019-02-10

Added

• Added ToMut trait, which allows borrowing mutably from a Coproduct or HList.
• Added support for #[derive(LabelledGeneric)] on tuple structs
• Added Path model and PathTraverser trait, which allows for composable lens-like-usage

Changed

• Make macros call themselves recursively with $crate::

[0.2.3]

• Skipped due to release mis-steps

[0.2.2] - 2018-10-21

• Added support for transmogrifying (recursively sculpting) one data type into another

[0.2.1] - 2018-09-29

• Upgraded to syn 0.15 and quote to 0.6

[0.2.0] - 2018-04-20

Added

• :confetti_ball: Forces joined with new collaborators [@​Centril] and [@​ExpHP]!
• frunk now adheres to semantic versioning!
• Inherent method wrappers for many trait methods on HList and Coproduct.
• Re-exports for a variety of essential items at the root level of frunk.
• Module frunk::prelude for extension traits and similar.
• Methods Coproduct::embed and Coproduct::subset.

... (truncated)

Commits

• 1bb2b7d [Release] 0.4.0 (#190)
• 44a0fef [CI] Add Rust cache (#189)
• f83e1d8 [Docs] Changelog updates (#188)
• 0a21dc4 Bump quote, syn and proc-macro2 to 1 (#183)
• b8fa846 Fix unicode identifiers support (#186)
• ad73d4a Make foldl and foldr take exactly same arguments (#178)
• 15e5ba1 0.4 cleanup: rename HList type macro, remove HList#length() (#179)
• d586e62 Merge pull request #177 from ImmemorConsultrixContrarie/foldr_doc_fix
• 9747b2a Doc fix
• a1f4383 [2021 04 16 release] 0.3.2 (#176)
• Additional commits viewable in compare view

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