updated Readme for config changes
updated Readme for config changes

brandonshin/slackbot-workout,prlakhani/slackbot-workout,freshbooks/slackbot-workout,jesseract/slackbot_exercise_bot,Heyllow/slack-workout,ArcBees/slackbot-workout,TeachersPayTeachers/slackbot-workout,jesseract/slackbot_exercise_bot,emillinden/slackbot-workout