Merge pull request #497 from SCOREC/apw/cmake-312

bump minimum CMake version to 3.12

Author: cwsmith

CMakeLists.txt

@@ -4,7 +4,7 @@ if(DEFINED TRIBITS_PACKAGE)
 endif()
 
 # This is the top level CMake file for the SCOREC build
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.12)
 
 project(SCOREC VERSION 4.0.0 LANGUAGES CXX C)