mode: done_one_trialを追加

受け取るパラメータ

 - trial_num
 - reward_map
 - selected
 - rt
 - start_datetime
 - user_id
 - browser

返すパラメータ

 - trial_num
 - reward_map(４つの数字)
Merge branch 'master' of https://github.com/melonsode/bandit