[readme] Fix supported sites list

Author: xenova

README.rst

@@ -182,8 +182,7 @@ Supported sites:
 -  YouTube.com - Livestreams, past broadcasts and premieres.
 -  Twitch.tv - Livestreams, past broadcasts and clips.
 -  Reddit.com - Livestreams, past broadcasts
-.. -  Facebook.com (currently in development) - Livestreams and past
-   broadcasts.
+
 
 .. _Chat Item Wiki: https://github.com/xenova/chat-downloader/wiki/Item-Template
 .. _Command Line Wiki: https://github.com/xenova/chat-downloader/wiki/Command-Line-Usage