fix: add teaser and checkbox breaking change to changelog (#1332)

* fix: add teaser breaking change to changelog version 27.0.0

* add note about checkbox breaking changes

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Co-authored-by: Eszter Hofmann <hofmann@textkernel.nl>

Author: andrentk

CHANGELOG.md

@@ -22,6 +22,7 @@ All notable changes to this project will be documented in this file. See [standa
 
 * **Tag:** 'size' is no longer a prop
 * **Dropdown:** Dropdown component API and structure changed
+* **Teaser:** Teaser component API and structure changed
 
 ### Features
 
@@ -118,6 +119,7 @@ All notable changes to this project will be documented in this file. See [standa
 * **css variables:** some unused CSS variables removed: `--line-medium`, `--line-thick`, `--outline-size`
 * **fonts:** `--font-weight-light` and `--font-wight-medium` were removed from the library
 * **typography:** changes to how basic text styles are applied to consuming applications see [README](/README.md#assign-base-class-to-body)
+* **checkbox** `indeterminate` state needs to be used in combination with `checked`. Before it was also showing when the checkbox was not checked. 
 
 ### Features