readme: fix message

Author: jcarpent

CMakeLists.txt

@@ -67,7 +67,7 @@ set(CMAKE_MODULE_PATH
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake-external"
                       ${CMAKE_MODULE_PATH})
 
-message("-- CMAKE_SYSTEM_PROCESSOR: ${CMAKE_SYSTEM_PROCESSOR}")
+message(STATUS "CMAKE_SYSTEM_PROCESSOR: ${CMAKE_SYSTEM_PROCESSOR}")
 if(INITIALIZE_EIGEN_WITH_NAN)
   add_definitions(-DEIGEN_INITIALIZE_MATRICES_BY_NAN)
 endif(INITIALIZE_EIGEN_WITH_NAN)