Bump floki from 0.26.0 to 0.28.0

[dependabot-preview[bot]]

Bumps floki from 0.26.0 to 0.28.0.

Changelog

Sourced from floki's changelog.

[0.28.0] - 2020-08-26

Added

• Add suport for :checked pseudo-class selector - thanks @wojtekmach

Changed

• Drop support for Elixir 1.6
• Update version of fast_html to 2.0 in docs and CI - thanks @rinpatch

Fixed

• Fix docs by mentioning HTML nodes supported for traverse_and_update - thanks @hubertlepicki

[0.27.0] - 2020-07-07

Added

• Floki.filter_out/2 now can filter text nodes - thanks @ckruse
• Support more enconding entities in Floki.raw_html/1 - thanks @ntenczar

Fixed

• Fix Floki.attribute/2 when there is only text nodes in the document - thanks @ckruse

Improvements

• Performance improvements of Floki.raw_html/1 function - thanks @josevalim
• Improvements in the docs and specs of Floki.traverse_and_update/2 and Floki.children/1 - thanks @josevalim
• Improvements in the spec of Floki.traverse_and_update/2 - thanks @Dalgona
• Improve the CI setup to run the formatter correctly - thanks @Cleidiano

Commits

• 7589d71 Bump version to 0.28.0
• 4c0b898 Merge pull request #301 from wojtekmach/wm-checked
• 205d7ca Support :checked pseudo-class
• 13412d4 Merge pull request #300 from philss/ps-drop-elixir-1.6
• 1ba6284 Fix wrong link in README
• e6080ff Require Elixir version ~> 1.7
• 0c2961c Merge pull request #299 from hubertlepicki/fix_traverse_and_update_spec_and_docs
• 3b9b42d Update traverse_and_update/2 and /3 docs and tests
• 4e3626d Fix docs and specs for children/2 and traverse_and_update/2
• a7de350 Merge pull request #298 from rinpatch/feat/fast-html-2.0
• Additional commits viewable in compare view

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