replace http:// urls with https:// (diameter files)

Change-Id: I4e129e9e74e13731f254db3d69e389187680d421
diff --git a/dia/diameter_3gpp_ts29_329.dia b/dia/diameter_3gpp_ts29_329.dia
index 8f588db..dc6dea8 100644
--- a/dia/diameter_3gpp_ts29_329.dia
+++ b/dia/diameter_3gpp_ts29_329.dia
@@ -7,7 +7,7 @@
 ;; you may not use this file except in compliance with the License.
 ;; You may obtain a copy of the License at
 ;;
-;;     http://www.apache.org/licenses/LICENSE-2.0
+;;     https://www.apache.org/licenses/LICENSE-2.0
 ;;
 ;; Unless required by applicable law or agreed to in writing, software
 ;; distributed under the License is distributed on an "AS IS" BASIS,