Wagtailmenus

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* Added support for Wagtail 2.9 (no code changes necessary) (Sekani Tembo).
* Added compatibility with Django Sites Framework (Sekani Tembo).
* Various documentation updates.

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* Added support for Django 3.0 and Wagtail 2.8 (thanks to Arkadiusz Michał Ryś).

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* Always fetch/use specific page data when rendering menus (see release notes for more details).
* Optimised 'derive page from URL' and 'derive section root' logic
* Added support for Django 2.2 (no code changes necessary).
* Added support for Wagtail 2.5 (no code changes necessary).
* Added support for Wagtail 2.6 (no code changes necessary).
* Added support for Wagtail 2.7.
* Added support for Python 3.8.
* Removed support for `get_sub_menu_templates()` methods that do not accept a **level** argument.
* Removed recommendation / automatic integration for `wagtail-condensedinlinepanel`.
* Fix: [329](https://github.com/jazzband/wagtailmenus/issues/329), which prevented level-specific template naming from working as specified in the docs.
* Fix: [323](https://github.com/jazzband/wagtailmenus/issues/323), which prevented `StreamField` from working properly when creating or editing menus with custom item models.

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* Fix: [329](https://github.com/jazzband/wagtailmenus/issues/329), which prevented level-specific template naming from working as specified in the docs.
* Fix: [323](https://github.com/jazzband/wagtailmenus/issues/323), which prevented `StreamField` from working properly when creating or editing menus with custom item models.

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* Dropped support for `relative_url()` methods on custom menu item models that do not support a `request` keyword argument.
* Added support for Wagtail 2.4.
* Added support for Wagtail 2.3.
* Added support for Django 2.1.
* Minor documentation updates (OktayAltay).
* Updated `MenuPage.get_repeated_menu_item()` to nullify `sub_menu` on the copy to reduce likelihood of infinite recursion errors.
* Updated `Menu._prime_menu_item()` to set `sub_menu` to None if no new value is being added, to reduce likelihood of infinite recursion errors.
* Updated `SectionMenu.prepare_to_render()` to augment `root_page` with `text`, `href` and `active_class` attributes, so that it no longer has to be done in `SectionMenu.get_context_data()`.
* Updated `AbstractLinkPage.get_sitemap_urls()` signature to match Wagtail 2.2 (Dan Bentley).
* Documentation typo correction and other improvements (DanAtShenTech).
* Fix an issue where the `WAGTAILMENUS_USE_CONDENSEDINLINEPANEL` setting wasn't being respected.

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* Fix: [329](https://github.com/jazzband/wagtailmenus/issues/329), which prevented level-specific template naming from working as specified in the docs.
* Fix: [323](https://github.com/jazzband/wagtailmenus/issues/323), which prevented `StreamField` from working properly when creating or editing menus with custom item models.