Fix CMakeList for older versions of CMake

cmake/utils.cmake

@@ -30,7 +30,7 @@ function(spdlog_enable_warnings target_name)
         $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>,$<CXX_COMPILER_ID:GNU>>:
             -Wall -Wextra -Wconversion -pedantic -Wfatal-errors>
         $<$<CXX_COMPILER_ID:MSVC>:/W4>)
-		if(MSVC_VERSION GREATER_EQUAL  1910)  #Allow non fatal security wanrnings for msvc 2015 
+		if(MSVC_VERSION GREATER  1900)  #Allow non fatal security wanrnings for msvc 2015
 			target_compile_options(${target_name} PRIVATE /WX)
 		endif()
 endfunction()