Minimum required CMake version is now 3.15.0 in order to be able to use list::PREPEND.

Signed-off-by: Jupp Tscheak <jupp.tscheak@daimler.com>

CMakeLists.txt

@@ -8,7 +8,7 @@
 # SPDX-License-Identifier: EPL-2.0
 ################################################################################
 
-cmake_minimum_required(VERSION 3.14.0 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.15.0 FATAL_ERROR)
 
 # Add the custom CMake modules to CMake's module path
 list(PREPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")