Drop light count to avoid panic.

There was a fix in the git version for this panic, but not in the latest release yet.

src/lights.rs

@@ -23,7 +23,7 @@ fn spawn_moving_lights(
 ) {
     let rng = &mut thread_rng();
     // spawn orbiting bisexual lights
-    for _ in 0..511 {
+    for _ in 0..255 {
         // mechanics
         let axis = crate::random_unit_vec(rng);
         let angle = rng.gen_range(0.0..TAU);