Prepare changelog

docs/devel/changelog_staging.md

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 <!-- SPDX-FileCopyrightText: 2022 geisserml <[email protected]> -->
 <!-- SPDX-License-Identifier: CC-BY-4.0 -->
 
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 # Changelog for next release
+
+- Prevent wheel content from wrongly being placed in a `purelib` folder by explicitly declaring
+  that pypdfium2 ships with a binary extension. This is relevant for some systems to separate
+  platform-dependant packages from pure-python packages (i. e. `/usr/lib64` instead of `/usr/lib`).
+  Confer PEP 427.
 - Added a new function `PdfDocument.get_version()` to obtain the PDF version of a document.