Merge pull request video-dev#464 from jlacivita/master

Updated README.md w/ CEA-708

README.md

@@ -111,11 +111,10 @@ All HLS resources must be delivered with [CORS headers](https://developer.mozill
   - [Redundant/Failover Playlists](https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/StreamingMediaGuide/UsingHTTPLiveStreaming/UsingHTTPLiveStreaming.html#//apple_ref/doc/uid/TP40008332-CH102-SW22)
   - Timed Metadata for HTTP Live Streaming (in ID3 format, carried in MPEG-2 TS)
   - AES-128 decryption (AES-128 mode)
-  - CEA-708 captions (pop-on, channel 1)
+  - CEA-708 captions
 
 ## Not Supported (Yet)
 
-  - CEA-708 captions (roll-up, paint-on, channel 2)
   - MP3 / WebVTT container
   - Alternate Audio Track Rendition (Master Playlist with alternative Audio)