v4.2.1

Changelog

7bebeda version bump
2cbfb90 Merge branch 'master' of https://github.com/gobuffalo/pop
d85be8b improved scope docs
7980e4a Merge pull request #18 from trevrosen/more-scope-doc
c61488d Merge branch 'master' into more-scope-doc
8e87bee Merge pull request #26 from gobuffalo/expose-callback-interfaces
165f07e expose the callback interfaces to make it clearer how they work
3d0b4e9 Merge branch 'master' into more-scope-doc
8e5ef0f Expand Scope example to show chaining

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