Fixed luajit includes

Author: JohanMabille

include/xeus-lua/xinterpreter.hpp

@@ -27,9 +27,9 @@ extern "C" {
 # include "lauxlib.h"
 # include "lualib.h"
 #else
-#include "luajit-2.0/lua.h"
-#include "luajit-2.0/lauxlib.h"
-#include "luajit-2.0/lualib.h"
+#include "luajit-2.1/lua.h"
+#include "luajit-2.1/lauxlib.h"
+#include "luajit-2.1/lualib.h"
 #endif
 }
 namespace nl = nlohmann;