Wagtail-seo

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* Fix for longitude and latitude with longer digits. Now allowing longitude
with 3 digits before the decimal point (e.g. +/- 100.12345).

* Replace ``wagtailseo.blocks.MultiSelectBlock`` with Wagtail's built-in
``wagtail.core.blocks.MultipleChoiceBlock``.

.. note::

You may need to make a corresponding find/replace update in your old
migrations in order for them to continue working.

* Requires Wagtail>=2.9

* Remove settings and references to AMP pages.

* You may need to make migrations in your project after updating

.. code-block:: shell

python manage.py makemigrations
python manage.py migrate

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* Added ``canonical_url`` field to ``SeoMixin``. Uses this as the page's
canonical URL if it is non-blank, otherwise uses the page's normal URL.

* Fix image URLs when media is hosted on external CDN.

* Return blank author if page owner is null/None.

* Documentation and minor code cleanup.