Update README for 0.4.0

Add live support entry to the changelog.

@@ -47,7 +47,6 @@ support for:
 - Alternate audio and video tracks
 - Subtitles
 - Segment codecs _other than_ H.264 with AAC audio
-- Live streams
 - Internet Explorer < 10
 
 ### Runtime Properties
@@ -119,6 +118,7 @@ bandwidth and viewport dimensions.
     - [Best RESOLUTION variant] OR [Best BANDWIDTH variant] OR [inital playlist in manifest]
 
 ## Release History
+ - 0.4.0: Live stream support
  - 0.3.0: Performance fixes for high-bitrate streams
  - 0.2.0: Basic playback and adaptive bitrate selection
  - 0.1.0: Initial release