Add missing changelog entries for past PRs
ADD
changelog/1992.feature.rst
+Added support for Zstandard (RFC 8878) when ``zstandard`` 1.18.0 or later is installed.
+Added the ``zstd`` extra which installs the ``zstandard`` package.
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ADD
changelog/2589.feature.rst
+Changed the error raised when connecting via HTTPS when the ``ssl`` module isn't
+available from ``SSLError`` to ``ImportError``.
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Add missing changelog entries for past PRs