Add ChangeLog.d entry for kern.arandom support.

Signed-off-by: nia <nia@netbsd.org>
diff --git a/ChangeLog.d/sysctl-arnd-support.txt b/ChangeLog.d/sysctl-arnd-support.txt
new file mode 100644
index 0000000..14ad674
--- /dev/null
+++ b/ChangeLog.d/sysctl-arnd-support.txt
@@ -0,0 +1,2 @@
+Features
+   * Added support to entropy_poll for the kern.arandom syscall supported on some BSD systems. Contributed by Nia Alarie in #3423.