Add pg 1.0.0 compatibility to 5.1.5 Changelog

[aried3r]

Was added here: a9c06f6

[rails-bot]

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[rails-bot]

Warning

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[bogdanvlviv]

@aried3r Thank you for your Pull Request!
Could you also please add this entry to 5-2-stable in https://github.com/rails/rails/blob/5-2-stable/activerecord/CHANGELOG.md file, under "Rails 5.2.0.rc1 (January 30, 2018)" since 13eff51

[aried3r]

Done: #32171