Update reek requirement from ~> 5.4.0 to ~> 6.0.4

[dependabot-preview]

Updates the requirements on reek to permit the latest version.

Changelog

Sourced from reek's changelog.

6.0.4 (2021-04-27)

• (Nicolas Ferrari) Add build-base to Dockerfile
• (Masataka Pocke Kuwabara and Daniel Santos Dantas) Reduce gem package size

6.0.3 (2021-01-11)

• (mvz) Require parser 3.0
• (mvz) In a refinement, assign smells to the refined module or class

6.0.2 (2020-10-17)

• (mvz) Loosen dependency on psych. This should resolve installation problems on mingw32
• (Cesario Uy) Fix typo in docs for "Boolean Parameter" smell
• (mvz) Set link metadata in gemspec

6.0.1 (2020-05-26)

• (Maxim Pertsov) Handle absolute paths for directories correctly

6.0.0 (2020-03-30)

• (mvz) Make codeclimate-engine-rb a development dependency
• (mvz) Drop support for Ruby 2.3
• (mvz) Raise error when legacy code comment format is used
• (mvz) Stop reporting NilCheck for safe navigation
• (likeath) Properly handle "Forward all" syntax

5.6.0 (2020-01-20)

• (mvz) Support Ruby 2.7
• (mvz) Loosen parser dependency to allow version 2.7.x

5.5.0 (2019-11-13)

• (mvz) Use the Parser class matching current ruby for parsing, instead of always picking version 2.6.

5.4.1 (2019-11-12)

• (Filipe Esperandio) Bump base Docker image to a more recent ruby version
• (Fernando Contreras) Add quotes inside directory configuration example in README

5.4.0 (2019-04-24)

• (Philippe Bernery) Enable regex for directory directives.

5.3.2 (2019-03-22)

... (truncated)

Commits

• e2c0c77 Merge pull request #1601 from troessner/fixups-for-6.0.4-preparation
• 7cb34ca Mention gem package reduction in changelog
• ad24b83 Fix expectation in yaml.feature
• 2931c34 Merge pull request #1600 from troessner/prepare-6.0.4
• e291f2d Prepare 6.0.4.
• c1a570a Merge pull request #1599 from frnico33/fix-docker-build
• 82e3551 Add build-base to Dockerfile
• 1fdc300 Merge pull request #1598 from dansdantas/reduce-gem-package-size
• 33d4d9b fix rubocop expand path failure
• ec83083 Reduce gem package size
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #50.