fix URL link

Author: brentru

adafruit_lifx.py

@@ -155,7 +155,7 @@ def set_brightness(self, selector, brightness):
 
     def set_color(self, selector, **kwargs):
         """Sets the state of the light's color within the selector.
-        Valid arguments: https://api.developer.lifx.com/v1/docs/colors
+        Valid arguments: https://api.developer.lifx.com/docs/set-state
         """
         return self._put(LIFX_URL+selector+'/state', kwargs)