Bump ancestry from 3.0.2 to 3.0.4

[dependabot-preview]

Bumps ancestry from 3.0.2 to 3.0.4.

Changelog

Sourced from ancestry's changelog.

Version [3.0.4] 2018-10-27

Fixes

• Properly detects non-integer columns (thx adam101)
• Arrange no longer drops nodes due to missing parents (thx trafium)

Version [3.0.3] 2018-10-23

This branch (3.x) should still be compatible with rails 3 and 4.
Rails 5.1 and 5.2 support were introduced in this version, but ongoing support
has been moved to ancestry 4.0

Fixes

• Reduce object allocation (thx NickLaMuro)
• Rails 5.1 fixes (thx ctrombley)
• Avoid redundant query to DB in subtree_of scope (thx Slike9)
• Syntax tweaks (thx ekohl, richardonrails)
• Fixed reverse ordering
• Dropped builds for ruby 1.9.3, 2.0, 2.1, and 2.2
• Dropped builds for Rails 3.x and 4.x (will use Active Record or syntax)

Commits

• 8df8da4 Merge branch 'version_304'
• 38db749 new version
• f4610ad Merge pull request #419 from kbrock/consistent_sorting
• aea6b73 Condense arrange_nodes
• 6cb6444 Fix arrange method dropping nodes without parents
• 603650d change sorting tests data to properly test cases
• f56ad4a Merge pull request #418 from kbrock/sorting_tests
• 08328a2 add ordering tests
• d586a04 change sorting test data
• 3480398 introduce and simplify existing ordering tests
• Additional commits viewable in compare view

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