Docs: Release notes for v1.5.0

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Signed-off-by: Summer Qin <summer.qin@arm.com>
Change-Id: If22ee9c6ec149a1ff6ebd60f4f5b284b5a273aa6
diff --git a/version.cmake b/version.cmake
index 874d87d..6261cd0 100644
--- a/version.cmake
+++ b/version.cmake
@@ -4,4 +4,4 @@
 # SPDX-License-Identifier: BSD-3-Clause
 #
 #-------------------------------------------------------------------------------
-set(TFM_VERSION 1.4.0)
+set(TFM_VERSION 1.5.0)