chore: prepare realease notes for 0.12.1

release-notes/0.12.1.md

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+# Release notes for cobrapy 0.12.1
+
+## New features
+
+* Fix/feature that allows summaries to work properly for models with multiple
+  exchange reactions for the same metabolite.
+* Require a later optlang version so that Gurobi can now be used for quadratic
+  problems.
+* cobrapy can now extract primal values from a wider range of solver states.
+  This is particularly useful to investigate problems in non-optimal states.
+
+## Fixes
+
+* Test different solvers on more text cases than previously.
+* Improve the way benchmarks are run.
+* Restore automatic documentation builds on readthedocs.org.
+* Correct a problem in how geomtric FBA retrieved solutions.
+* Update the use of pandas interface of the sampler.
+* Correct the sanity checks for the new ROOM implementation.
+
+## Deprecated features
+
+## Backwards incompatible changes
+
+* cobrapy functions that return solution only raise `OptimizationError`s rather
+  than also potentially raising a `RuntimeError`.
+* Linear MOMA is the new default method. It used to be MOMA which excludes GLPK
+  as a solver due to being a quadratic optimization problem.