HighLine：HighLine.color_scheme, .color_scheme=

>> require "highline/import"
=> true
>> HighLine.color_scheme
=> nil
>> ft = HighLine::ColorScheme.new {|cs| cs[:headline] = [ :bold, :yellow, :on_black ]}
=> #<HighLine::ColorScheme:0xb7a1ab28 @scheme={"headline"=>["\e[1m", "\e[33m", "\e[40m"]}>
>> HighLine.color_scheme
=> nil
>> HighLine.color_scheme = ft
=> #<HighLine::ColorScheme:0xb7a1ab28 @scheme={"headline"=>["\e[1m", "\e[33m", "\e[40m"]}>
>> HighLine.color_scheme 
=> #<HighLine::ColorScheme:0xb7a1ab28 @scheme={"headline"=>["\e[1m", "\e[33m", "\e[40m"]}>