README: Remove mention of properties page and browser plugin

The properties page was moved to nautilus, the browser plugin removed
in 3.14.

README

@@ -6,8 +6,7 @@ Totem is movie player for the GNOME desktop based on GStreamer.
 It features a playlist, a full-screen mode, seek and volume controls,
 as well as complete keyboard navigation.
 
-Apart from a movie player, it also includes a Mozilla plugin, and a
-Nautilus thumbnailer and properties page.
+Apart from a movie player, it also includes a video thumbnailer.
 
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