Add Colour.from_rgb.

discord/colour.py

@@ -97,6 +97,11 @@ class Colour:
         """Returns an (r, g, b) tuple representing the colour."""
         return (self.r, self.g, self.b)
 
+    @classmethod
+    def from_rgb(cls, r, g, b):
+        """Constructs a :class:`Colour` from an RGB tuple."""
+        return cls((r << 16) + (g << 8) + b)
+
     @classmethod
     def default(cls):
         """A factory method that returns a :class:`Colour` with a value of 0."""