Bump ancestry from 2.0.0 to 3.0.2

[dependabot-preview]

Bumps ancestry from 2.0.0 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)

Version [3.0.1] 2017-07-05

Fixes

• added gem metadata
• fixed keep a changelog link (thx mattbrictson)
• added alias has_parent?
• fixed bug where unscoping too much (thx brendon)
• fixed tests on mysql 5.7 and rails 3.2
• Dropped 3.1 scope changes

Version [3.0.0] 2017-05-18

Changed

• Dropping Rails 3.0, and 3.1. Added Rails 5.1 support (thx ledermann)
• Dropping Rails 4.0, 4.1 for build reasons. Since 4.2 is supported, all 4.x should still work.

Fixes

• Performance: Use pluck vs map for ids (thx njakobsen and culturecode)
• Fixed acts_as_tree compatibility (thx crazymykl)
• Fixed loading ActiveRails prematurely (thx vovimayhem)
• Fixes exist (thx ledermann)
• Properly touches parents when different class for STI (thx samtgarson)
• Fixed issues with parent_id (only present on master) (thx domcleal)

Version [2.2.2] 2016-11-01

Changed

• Use COALESCE only for sorting versions greater than 5.0
• Fixed bug with explicit order clauses (introduced in 2.2.0)
• No longer load schema on has_ancestry load (thx ledermann)

Version [2.2.1] 2016-10-25

Sorry for blip, local master got out of sync with upstream master.
Missed 2 commits (which are feature adds)

... (truncated)

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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