Add a changelog entry.

diff --git a/doc/news/changes/incompatibilities/20190926Bangerth b/doc/news/changes/incompatibilities/20190926Bangerth
new file mode 100644 (file)
index 0000000..f021867
--- /dev/null
+++ b/doc/news/changes/incompatibilities/20190926Bangerth
@@ -0,0 +1,6 @@
+Changed: Several variations of the
+DoFTools::make_periodicity_constraints() function expressed the
+`direction` as an `int` variable. But it's really an unsigned
+quantity, and as a consequence was changed to `unsigned int`.
+<br>
+(Wolfgang Bangerth, 2019/09/26)