moved optional argument down to group the mandatory objects on top

generators/gameOfLife.py

@@ -40,8 +40,8 @@ def get_neighbors(x, y):
 
 if __name__ == "__main__":
     argument_parser = argparse.ArgumentParser(description="Game of Life bml generator")
-    argument_parser.add_argument('-w', dest="world", type=list, default=None, help="pre-constructed world (optional)")
     argument_parser.add_argument('-o', dest="output_path", type=str, help="output file (mandatory)")
+    argument_parser.add_argument('-w', dest="world", type=list, default=None, help="pre-constructed world (optional)")
     argument_parser.add_argument('-d', dest="delay", type=int, default=300, help="delay between frames (optional)")
     args = argument_parser.parse_args()