Update changelog.md

changelog.md

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-- **v2.3.1** - 2025/01/?? - Bug correction in automatic cleanup of preliminary models; Lower boundary of q decreased to 1.e-7; Refinement of offset degeneracy calculation; update to VBMicrolensing 4.2
+- **v2.3.1** - 2025/01/?? - Bug correction in automatic cleanup of preliminary models; Lower boundary of q decreased to 1.e-7; Refinement of offset degeneracy calculation; update to VBMicrolensing 4.2.1
 - **v2.3** - 2024/11/28 - Update to VBMicrolensing 4.1.2; minor bug in re-normalization; additional accurate initial conditions for planetary events; check each binary-lens fit for offset degeneracy; changed maximal steps in each parameter in LevMar; a few bugs corrected in covariance reports; ellipsoid increased by delta chi square and more accurate check of duplicates in model selection; models above Wilks' theorem trheshold are removed in Finalizer; accuracy option in plotmodel; source trajectory and caustic in templates.show_template(). 
 - **v2.2** - 2024/10/25 - Replaced VBBinaryLensing with VBMicrolensing; Added the possibility to constrain fits;  possibility to choose model categories to fit; possibility to make just a quick update to previously found models; added Keplerian orbital motion for binary lenses as model category "LK"; partial implementation of static triple-lenses, triple-lenses with parallax; optimization of ModelSelector excluding higher chi square models from check; possibility to cleanup event directory from preliminary models, thus saving 99% disk space.
 - **v2.1.1** - 2024/09/11 - Re-ordering peaks in InitCond to promote peaks appearing in more datasets.