Update links to the latest asciicast format version

Author: ku1ik

README.md

@@ -6,7 +6,7 @@ __asciinema player__ is a web player for terminal sessions recordings.
 
 Unlike typical web _video_ players, which play heavyweight video files (`.mp4`,
 `.mov`), asciinema player plays lightweight terminal session recordings in the
-text-based [asciicast](https://docs.asciinema.org/manual/asciicast/v2/) format
+text-based [asciicast](https://docs.asciinema.org/manual/asciicast/v3/) format
 (`.cast`), such as those produced by the [asciinema
 recorder](https://docs.asciinema.org/manual/cli/).
 

src/parser/README.md

@@ -59,10 +59,12 @@ AsciinemaPlayer.create({ url: url, parser: 'built-in-parser-name' }, containerEl
 
 ### asciicast
 
-`asciicast` parser handles both [asciicast
-v1](https://github.com/asciinema/asciinema/blob/develop/doc/asciicast-v1.md) and
+`asciicast` parser handles [asciicast
+v1](https://github.com/asciinema/asciinema/blob/develop/doc/asciicast-v1.md),
 [asciicast
 v2](https://github.com/asciinema/asciinema/blob/develop/doc/asciicast-v2.md)
+and [asciicast
+v3](https://github.com/asciinema/asciinema/blob/develop/doc/asciicast-v3.md)
 file formats produced by [asciinema
 recorder](https://github.com/asciinema/asciinema).