Add changelog entry (FFDH in TLS 1.3)

Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
diff --git a/ChangeLog.d/ffdh-tls-1-3.txt b/ChangeLog.d/ffdh-tls-1-3.txt
new file mode 100644
index 0000000..139b762
--- /dev/null
+++ b/ChangeLog.d/ffdh-tls-1-3.txt
@@ -0,0 +1,2 @@
+Features
+   * Add usage of FFDH keys in TLS 1.3.