Add a changelog entry

Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
diff --git a/ChangeLog.d/timeless.txt b/ChangeLog.d/timeless.txt
new file mode 100644
index 0000000..84f07d6
--- /dev/null
+++ b/ChangeLog.d/timeless.txt
@@ -0,0 +1,3 @@
+Bugfix
+   * Fix compile errors when MBEDTLS_HAVE_TIME is not defined. Add tests
+     to catch bad uses of time.h.