HighLine：HighLine.using_color_scheme?

>> require "highline/import"
=> true
>> HighLine.using_color_scheme?
=> false
>> ft = HighLine::ColorScheme.new {|cs| cs[:headline] = [ :bold, :yellow, :on_black ]}
=> #<HighLine::ColorScheme:0xb79f290c @scheme={"headline"=>["\e[1m", "\e[33m", "\e[40m"]}>
>> HighLine.color_scheme = ft
=> #<HighLine::ColorScheme:0xb79f290c @scheme={"headline"=>["\e[1m", "\e[33m", "\e[40m"]}>
>> HighLine.using_color_scheme?
=> true