Updated spawnY to match lowest reasonable spawn coordinate

Author: greatmastermario

overviewer_core/world.py

@@ -198,8 +198,8 @@ def find_true_spawn(self):
         disp_spawnZ = spawnZ = data['SpawnZ']
 
         ## clamp spawnY to a sane value, in-chunk value
-        if spawnY < 0:
-            spawnY = 0
+        if spawnY < -63:
+            spawnY = -63
         if spawnY > 319:
             spawnY = 319