Update tradfri.markdown (home-assistant#3185)

heennkkee · fabaff · commit cb416a65e88b · 2017-08-16T10:14:11.000+02:00
Added a warning for windows users that the Tradfri component doesn't work. Source: home-assistant/core#7735 (comment) If anyone has a more technical source it would be neat.
diff --git a/source/_components/tradfri.markdown b/source/_components/tradfri.markdown
@@ -18,6 +18,9 @@ The `tradfri` component supports for the IKEA Trådfri (Tradfri) gateway. The ga
 
 For this to work, you need to install a modified lib-coap library.
 
+<p class='note warning'>
+This component does **not** work on Windows, as the modified lib-coap doesn't exists for Windows.
+</p>
 <p class='note'>
 If you are using [Hass.io](/hassio/) then just move forward to the configuration as all requirements are already fullfilled.
 </p>
