Add a changelog entry.

diff --git a/doc/news/changes/minor/20180403Bangerth b/doc/news/changes/minor/20180403Bangerth
new file mode 100644 (file)
index 0000000..d582885
--- /dev/null
+++ b/doc/news/changes/minor/20180403Bangerth
@@ -0,0 +1,5 @@
+New: There is now a function dynamic_unique_cast() that does for
+`std::unique_ptr` objects what `dynamic_cast` does for regular
+pointers.
+<br>
+(Wolfgang Bangerth, 2018/04/03)