From: Paul Zander <negril.nx+gentoo@gmail.com>

Bump cmake minimum version to remove warning

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 88d34f0..232c643 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 3.1 FATAL_ERROR)
+cmake_minimum_required (VERSION 3.5 FATAL_ERROR)
 
 set (CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/adm/cmake")
 
