Added random start

before: no random_start, always start at (0, 0)
after: start randomly

src/simplegen.c

@@ -23,6 +23,7 @@
 void simple_generation(int width)
 {
     grid *gd = init_grid(width);
+    random_start(gd);
     refresh_grid(gd);
 
     print_simple_grid(gd);