Add ChangeLog entry

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/ChangeLog.d/rm-ssl-conf-curves.txt b/ChangeLog.d/rm-ssl-conf-curves.txt
new file mode 100644
index 0000000..4b29adc
--- /dev/null
+++ b/ChangeLog.d/rm-ssl-conf-curves.txt
@@ -0,0 +1,4 @@
+Removals
+   * Remove the function mbedtls_ssl_conf_curves() which had been deprecated
+     in favour of mbedtls_ssl_conf_groups() since Mbed TLS 3.1.
+