Add release note for mdn#12230

ddbeck · Sep 10, 2021 · 9573ff2 · 9573ff2
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 RELEASE DATE TK
 
+### Notable changes
+
+- The historic `api.IDBEnvironment` mixin has been removed. ([#12230](https://github.com/mdn/browser-compat-data/pull/12230))
+
 ### Known issues
 
 - In [v3.3.9](https://github.com/mdn/browser-compat-data/releases/tag/v3.3.9), the structure of features for `css.properties.place-content`, `place-items`, and `place-self` changed ([#11214](https://github.com/mdn/browser-compat-data/pull/11214)). This is an incomplete fix to the problem of undocumented namespaces appearing in places where you might otherwise expect compatability data. The restructuring of the data is a work in progress and may change again in a future release. See [#6175](https://github.com/mdn/browser-compat-data/issues/6175) for more information.