Add ChangeLog entry

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
diff --git a/ChangeLog.d/session-cache.txt b/ChangeLog.d/session-cache.txt
new file mode 100644
index 0000000..a12db3c
--- /dev/null
+++ b/ChangeLog.d/session-cache.txt
@@ -0,0 +1,5 @@
+Changes
+    * When using session cache based session resumption on the server,
+      double-check that custom session cache implementations return
+      sessions which are consistent with the negotiated ciphersuite
+      and compression method.