Prepare release notes for 3.3

doc/history.rst

@@ -1,13 +1,24 @@
 Release history
 ===============
 
+Version 3.3
+-----------
+
+- ``PKG-INFO`` files in sdists are now generated the same way as ``METADATA`` in
+  wheels, fixing some issues with sdists (:ghpull:`410`).
+- ``flit publish`` now sends SHA-256 hashes, fixing uploads to GitLab package
+  repositories (:ghpull:`416`).
+- The ``[project]`` metadata table from :pep:`621` is now fully supported and
+  :ref:`documented <pyproject_toml_project>`. Projects using this can now
+  specify ``requires = ["flit_core >=3.2,<4"]`` in the ``[build-system]`` table.
+
 Version 3.2
 -----------
 
 - Experimental support for specifying metadata in a ``[project]`` table in
   ``pyproject.toml`` as specified by :pep:`621` (:ghpull:`393`). If you try
   using this, please specify ``requires = ["flit_core >=3.2.0,<3.3"]`` in the
-  ``[build-system`` table for now, in case it needs to change for the next
+  ``[build-system]`` table for now, in case it needs to change for the next
   release.
 - Fix writing METADATA file with multi-line information in certain fields
   such as ``Author`` (:ghpull:`402`).