Bump ancestry from 3.0.1 to 3.0.2

[dependabot-preview]

Bumps ancestry from 3.0.1 to 3.0.2.

Changelog

Sourced from ancestry's changelog.

Version [3.0.2] 2018-04-24

Fixes

• fixed order_by_ancestry bug
• fixed order tests for postgres on mac (it uses a different collation)
• fixed documentation (thx besquared, danfrenette, eiwi1101, isimluk, mabusaad, tilsammans)
• added missing Ancestry::version
• added Rails 5.2 support (thx jjuliano)

Commits

• 47a8ecd 3.0.2
• 8e509ad Merge branch '302_changelog'
• 676375b 302 changelog (and pre 4.0 stuff)
• 923ef5a Merge pull request #385 from kbrock/docs
• c56aec2 improve docs for instance methods
• 8b84070 Merge pull request #384 from kbrock/deprecations
• 4fd4b7c For older versions of rails, still use arel in order clause
• f90c10b Rails 5.2
• e079348 Fix ancestor_ids_was
• 3821ff0 Fix 'dangerous errors' when using in Rails 5.2
• Additional commits viewable in compare view

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