Merge pull request lazychaser#354 from billriess/v4

Support Laravel 5.8

Merge pull request lazychaser#307 from bonzai/v4

Support Laravel 5.7

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Fixed lazychaser#252: nested eagers for ancestors and descendants are…

… now loaded

Bump minor version

lazychaser#217: parent_id, lft and rgt are reset when replicating a node

Fixed eager loading with scoping

Refactored ancestors and descendants relations

Update changelog

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