Update bg.m3u

Added links from https://github.com/iptv-org/iptv/issues/2187#issuecomment-808905666

channels/bg.m3u

@@ -15,3 +15,7 @@ http://31.13.223.104:1935/travel/travel.stream/playlist.m3u8
 http://141.136.14.18/kanal1/kanal1.m3u8
 #EXTINF:-1 tvg-id="TV+ BG" tvg-name="TV+ BG" tvg-country="BG" tvg-language="Bulgarian" tvg-logo="https://i.imgur.com/W074hkS.jpg" group-title="",TV+
 http://141.136.14.18/kanal1/kanal1_1500/index.m3u8
+#EXTINF:-1 tvg-id="DiemaSport.bg" tvg-name="Diema Sport" tvg-country="BG" tvg-language="Bulgarian" tvg-logo="" group-title="Sport",Diema Sport
+http://136.243.177.164/DIEMASPORT/playlist.m3u8
+#EXTINF:-1 tvg-id="DiemaSport2HD.bg" tvg-name="Diema Sport 2 HD" tvg-country="BG" tvg-language="Bulgarian" tvg-logo="" group-title="Sport",Diema Sport 2 HD
+http://136.243.177.164/DIEMASPORT2/playlist.m3u8