Pyramid-openapi3

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* Support disabling of endpoint validation via INI files.
[zupo]

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* Allow relative file `$ref` links in OpenApi spec, refs 93.
[damonhook]

* Validate that all endpoints in the spec have a registered route, refs 21.
[phrfpeixoto]

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* Add support for openapi-core 0.13.4.
[sjiekak]

* Add the ability to toggle request/response validation independently through
registry settings.
[damonhook]

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* Brown-bag release.
[zupo]

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* Raise a warning when a bad API spec causes validation errors to be discarded.
[matthewwilkes]

* Fix `custom_formatters` support in latest openapi-core 0.13.3.
[simondale00]

* Declare a minimal supported version of openapi-core.
[zupo]

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* Fix extract_errors to support lists, refs 75.
[zupo]