Slightly increase board size

main.cc

@@ -219,7 +219,7 @@ int main()
 	srand(time(0));
 
 	// Create a world
-	const unsigned int l(20), h(10);
+	const unsigned int l(50), h(15);
 	const double wallProbability(0.2);
 
 	World w(l, h, wallProbability);