Bump slim from 3.0.8 to 4.0.1

[dependabot-preview]

Bumps slim from 3.0.8 to 4.0.1.

Changelog

Sourced from slim's changelog.

4.0.1 (2018-09-02)

• Fix incompatibility issue with Slim Include plugin and new ability to specifiy attributes for embedded engines #819

4.0.0 (2018-08-26)

• Add ability to specify attributes for embedded engines using TagEngine - #653
• Set Tilt's default encoding to utf-8 - #800
• Prevent generation of invalid Ruby code in heredoc - #770
• Don't convert underscores to dashes on data attributes - #807 [Backward incompatible]
• Update description in README.jp.md - #795
• Removed support for embedded engines: Asciidoc, Builder, Creole, Erb, Nokogiri, Opal, Org-Ruby, Styl, Wikicloth
• Fix tests

3.0.9 (2017-11-09)

• Fixed Cross-site Scripting in splat attributes names (See #767)
• Restrict access to public methods in logic_less templates (See #781)

Commits

• 6612c0f version 4.0.1 to address Include plugin issue
• 972697b add emphasis that pretty mode is for debugging purposes
• 6e4fb39 remove deprecated syntax from tests
• b19b8fa issue #769
• 5686aa4 missed these in previous commit
• 8e469c5 more sinatra tests. fix issue #819
• 65902d2 copying sinatra slim tests into repo to build on them
• f2f1e51 update version for semver compatibility
• 82d44f7 add date to CHANGES
• 9125c78 not sure how i did an l for a 1
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #119.