game duration updated

Author: thamaraiselvam

lib/utils/Config.dart

@@ -1,3 +1,3 @@
-const int gameDuration = 10;
+const int gameDuration = 60;
 const Map costs = {'success': 1000, 'fail': -500, 'block': 100};
 const int maxKeepGameHistoryCount = 6;