update whatsnew

lmfit · Apr 5, 2023 · 8e5c5d2 · 8e5c5d2
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diff --git a/doc/whatsnew.rst b/doc/whatsnew.rst
@@ -26,6 +26,7 @@ New features:
 
 Bug fixes/enhancements:
 
+- fix bug when setting ``param.vary=True`` for a constrained parameter (Issue #859; PR #860)
 - fix bug in reported uncertainties for constrained parameters by better propating uncertainties (Issue #855; PR #856)
 - Coercing of user input data and independent data for ``Model`` to float64 ndarrays is somewhat less aggressive and
   will not increase the precision of numpy ndarrays (see :ref:`model_data_coercion_section` for details). The resulting