added interval

lib/UserInterface.cpp

@@ -1,7 +1,7 @@
 #include "UserInterface.hpp"
 
-const int UserInterface::interval = 0;     // in ms
-const int UserInterface::miniInterval = 0; // in ms
+const int UserInterface::interval = 500;     // in ms
+const int UserInterface::miniInterval = 50; // in ms
 const int UserInterface::maxDay = 28;
 const int UserInterface::maxMonth = 12;
 const int UserInterface::maxYear = 100;