Document clone()

Author: z38

README.md

@@ -453,12 +453,13 @@ See [index.html](https://github.com/bgrins/TinyColor/blob/master/index.html) in
 
 ## Common operations
 
-### Cloning
+### clone
 
-To clone a color, you can simply instantiate a new tinycolor with the old one's `toString` output.  The new color is a copy of the first one, so any changes to one won't affect the other.  See this example:
+`clone: function() -> TinyColor`.
+Instantiate a new TinyColor object with the same color.  Any changes to the new one won't affect the old one.
 
     var color1 = tinycolor("#F00");
-    var color2 = tinycolor(color1.toString());
+    var color2 = color1.clone();
     color2.setAlpha(.5);
 
     color1.toString(); // "#ff0000"