Add a changelog entry.

diff --git a/doc/news/changes/minor/20200116Bangerth b/doc/news/changes/minor/20200116Bangerth
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+Deprecated: The CellAccessor::active() function did not satisfy the
+usual naming scheme of that class in which functions are called
+CellAccessor::is_ghost(), CellAccessor::is_locally_owned(), etc. As a
+consequence, there is now a new function CellAccessor::is_active(),
+with the old function deprecated.
+<br>
+(Wolfgang Bangerth, 2020/01/16)