Version 0.2.0

• Overloaded Color.__or__(self, other) to get euclidean distance with pipe operator
• Added Color.get_nearest_web_color(color) to get nearest web color
• Renamed Hex subclass to HEX for consistency with other subclasses
• Added OKLAB subclass
• Overloaded Color.__add__(self, other) to get midpoint in OKLAB
• Overloaded Color.__neg__(self) to get complement in OKLAB
• Overloaded Color.__sub__(self, other) to add self with other's complement
• Added gamut clipping functions:
  • gamut_clip_hue_dependent(color)
  • gamut_clip_hue_independent(color)
  • gamut_clip_preserve_lightness(color)