fix commands in readme
fix commands in readme

lookback/ObjectiveDDP,yhyuan/ObjectiveDDP,gumpyoung/ObjectiveDDP,hiddenswitch/ObjectiveDDP,gumpyoung/ObjectiveDDP,boundsj/ObjectiveDDP,lookback/ObjectiveDDP,lookback/ObjectiveDDP,emmerge/ObjectiveDDP,gumpyoung/ObjectiveDDP,gumpyoung/ObjectiveDDP,emmerge/ObjectiveDDP,hiddenswitch/ObjectiveDDP,yhyuan/ObjectiveDDP,yhyuan/ObjectiveDDP,boundsj/ObjectiveDDP,boundsj/ObjectiveDDP,hiddenswitch/ObjectiveDDP,emmerge/ObjectiveDDP,hiddenswitch/ObjectiveDDP,yhyuan/ObjectiveDDP,boundsj/ObjectiveDDP,emmerge/ObjectiveDDP,lookback/ObjectiveDDP