message: use logged timer in main.py
diff: @@ -14,7 +14,7 @@ from gtp_wrapper import make_gtp_instance, MCTSPlayer
  from load_data_sets import DataSetV2
  from dual_net import DualNetwork
  import selfplay_mcts
  -from utils import timer
  +from utils import logged_timer as timer
  import ds_wrangler
  import evaluation
  import sgf_wrapper
  