Djangocms-bootstrap4

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* Added Django 2.x support
* Fixed test matrix
* Fixed an issues with links showing up twice in carousel (69)
* Exclude ``tests`` folder from release build

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* Removed support for Django 1.8, 1.9, 1.10
* Fixed a regression with spacing utilities rendering incorrectly
* Fixed a regression where migrations are failing

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* Fixed a regression with collapse plugins

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* Adapt Bootstrap4Picture to reflect djangocms_picture.AbstractPicture changes regarding Responsive Images (65)

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* Fix README migration command
* Fix Plural-Forms of i18n for english language
* Add <code> element inside <pre> in code block
* Fix spacing class for XS devices

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* Fixed a bug where offset values wouldn't be rendered in bootstrap grid
* Fixed a bug where offset and order fields wouldn't allow for zeroes