Add changelog

geodynamics · Mar 26, 2024 · 3a36a0a · 3a36a0a
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+Changed: The solver used during the expensive iterations of
+the AMG preconditioner has been changed from the trilinos implementation
+to the one provided by deal.II. The new solver should be faster and more
+stable, but can produce marginally different results.
+<br>
+(Rene Gassmoeller, 2024/03/26)