Collective.lazysizes

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- Nothing changed yet.

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- Update lazysizes to v4.1.6.
[hvelarde]

- Add support for Plone 5.2 and Python 3.
[hvelarde]

- Drop explicit support for Plone 5.0.
[hvelarde]

- Code clean up.
[hvelarde]

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- Upgrade lazysizes to v4.1.4.
[hvelarde]

- Set webpack ``output.libraryTarget`` to ``var`` and do not import the UMD version of lazysizes to avoid ``Mismatched anonymous define() module`` error in Plone 5 (refs. `67 <https://github.com/collective/collective.lazysizes/issues/67>`_).
[thet, rodfersou]

- Update Brazilian Portuguese and Spanish translations.
[hvelarde]

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- Set webpack ``output.libraryExport`` to ``default`` to avoid ``Mismatched anonymous define() module`` error (fixes `67 <https://github.com/collective/collective.lazysizes/issues/67>`_).
[rodfersou, hvelarde]

- Upgrade lazysizes to v4.1.2.
[thet]

- Add browser layer to ``collective.lazysizes.resources`` viewlet registration;
this avoids showing the viewlet when the package is not yet installed (fixes `69 <https://github.com/collective/collective.lazysizes/issues/69>`_).
[erral]

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- Avoid ``ImportError`` while running upgrade step v10 (fixes `63 <https://github.com/collective/collective.lazysizes/issues/63>`_).
[hvelarde]

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- Deprecate resource registries;
instead, we now use a viewlet in ``plone.htmlhead`` to load JavaScript code.
This simplifies maintainance of the add-on among multiple Plone versions.
[hvelarde]

- Upgrade lazysizes to v4.1.1.
[hvelarde]

- Add lazysizes print plugin;
this plugin will automatically unveil all elements as soon as a print is detected even if the given lazyload image isn't in the viewport (fixes `50 <https://github.com/collective/collective.lazysizes/issues/50>`_).
[thet, hvelarde]

- Remove unused ``collective.lazysizes.ImageScales`` vocabulary.
[hvelarde]

- Process static resources using webpack.
[rodfersou]

- Avoid ``ValueError`` when upgrading from profile version 3 (fixes `46 <https://github.com/collective/collective.lazysizes/issues/46>`_).
[hvelarde]