Add custom card breaking change note to 2021.6 release notes

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Franck Nijhof 2021-06-02 18:59:03 +02:00
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@ -343,6 +343,23 @@ For more information, see [the HTTP integration documentation](/integrations/htt
{% enddetails %}
{% details "Custom cards" %}
We upgraded our frontend to use Lit 2.0. During the beta we have noticed some
custom cards or views are using `LitElement` and `lit-html` from our components.
This is not a recommended practice, and might now cause the custom card to
break this release. If you encounter issues with a custom card, please
report this issue with the custom card developer.
Additional information about this change and information for custom card
developers on how to upgrade their card, can be found in our
developer blog:
["Upgrade to Lit 2.0"](https://developers.home-assistant.io/blog/2021/05/19/lit-2.0)
{% enddetails %}
{% details "Custom integrations (custom_components)" %}
As mentioned in every release since 2021.3, custom integrations will require a