Update sd.m3u

- added 2 channels
- updated channel names

channels/sd.m3u

@@ -9,3 +9,7 @@ http://livecdnh2.tvanywhere.ae/hls/blue_nile/04.m3u8
 http://tayba.live.net.sa:1935/tayba/taybatv/chunklist_w1376954935.m3u8
 #EXTINF:-1 tvg-id="" tvg-name="" tvg-logo="http://www.elahmad.com/tv/images/taybatv.jpg" group-title="",Tayba TV
 http://tayba.live.net.sa:1935/tayba/taybatv/gmswf.m3u8
+#EXTINF:-1 tvg-id="" tvg-name="" tvg-logo="https://i.imgur.com/vn9jvdV.png" group-title="",Africa TV2
+http://africatv.live.net.sa:1935/live/africatv2/playlist.m3u8
+#EXTINF:-1 tvg-id="" tvg-name="" tvg-logo="https://i.imgur.com/vn9jvdV.png" group-title="",Africa TV3
+http://africatv.live.net.sa:1935/live/africatv3/playlist.m3u8