Add changelog.

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+Changed: The GridRefinement::hyper_sphere() function used to have two
+template arguments (`dim` and `spacedim`), but it really only existed
+if <code>dim == spacedim-1</code>. Consequently, it now has lost its
+`dim` template argument and has only retained `spacedim`.
+<br>
+(Wolfgang Bangerth, 2018/01/25)