docs: prepare release notes for 0.22.0

Author: Midnighter

release-notes/0.22.0.md

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+# Release notes for cobrapy 0.22.0
+
+## New features
+
+- Add support for the OSQP and COIN-OR CBC solvers (#946)
+
+## Fixes
+
+- Fix the `Reaction.compartments` attribute not updating after metabolite changes (#1055)
+- Lots of syntax, annotation, and docstring fixes (#1058, #1059, #1060, #1063,
+  #1065, #1066, #1076, #1077, #1080)
+- Multiprocessing on windows now sends data to processes via a pickle file which
+  should speed up any multiprocessing initialization (#1070)
+- Upgrade optlang and fix some tolerance issues (#1011)
+- Enable Python 3.9 (#1082)
+
+## Documentation
+
+- Document boundary reactions (#1038)
+- Documentation is now built again on each release (#1047)
+- Clarify pfba in the documentation (#1049)
+
+## Other
+
+- COBRApy source code releases are now deposited on Zenodo which provides a
+  citeable DOI (#1061)
+- COBRApy creates automatic releases to BioSimulators (#1064)
+- Fix deployment of releases to the website (#1068)
+- Improve the `pyproject.toml` config (#1067)
+
+## Backwards incompatible changes
+
+- Remove some particular `cobra.Reaction.lower_bound` and `.upper_bound`
+  behaviour that has been deprecated for a long time.