Add a changelog.

diff --git a/doc/news/changes/minor/20240820Bangerth b/doc/news/changes/minor/20240820Bangerth
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+Fixed: The FiniteElement::has_support_points() function is poorly
+named because it does not return *whether* an element has support
+points, but whether it *implements* the
+FiniteElement::get_unit_support_points() function correctly. Because
+of this misunderstanding, it returned `false` for the FE_Nothing
+element. This is now fixed: FE_Nothing::has_support_points() now
+returns `true`, because the empty array returned by
+FE_Nothing::get_unit_support_points() correctly describes the support
+points the element has (namely: it does not have any, as there are no
+degrees of freedom).
+<br>
+(Wolfgang Bangerth, 2024/05/19)