def to_s
      current_user = GitConfig.current_user
      users.map do |user|
        if current_user == user
          "  ==> #{user.to_s[5,user.to_s.length]}"
        else
          user.to_s
        end
      end.join "\n"
    end
def to_s
      current_user = GitConfig.current_user
      users.map do |user|
        if current_user == user
          "  ==> #{user.to_s[5,user.to_s.length]}"
        else
          user.to_s
        end
      end.join "\n"
    end
Override to_s to output correct format