v1.10.0

• Added -C command line option to specify secondary color for terminal
  graphs, accepting color values between 0 - 255
  • Updated Hackmac::Graph.new call to include color_secondary: parameter
  • Modified usage method to document the new -C option
  • Maintained backward compatibility with existing -c color option
• Added support for color_secondary, adjust_brightness, and
  adjust_brightness_percentage parameters in Hackmac::Graph#initialize
• Introduced pick_secondary_color method to calculate secondary colors based
  on brightness adjustments
• Updated draw_graph to use secondary colors for improved visual contrast
• Modified Hackmac::Graph::Display#initialize to accept color and
  on_color parameters
• Configured @display and @old_display with default color settings in
  Hackmac::Graph#reset_display
• Default adjust_brightness to :lighten with 15% brightness
  adjustment
• Default foreground_color to :white and background_color to :black
• Added conditional check if @plist before extending with
  Hashie::Extensions::DeepFind to prevent NoMethodError when @plist is
  nil or undefined