Updated README to reflect changes in HLS-9
Updated README to reflect changes in HLS-9

file:a/README.md -> file:b/README.md
--- a/README.md
+++ b/README.md
@@ -43,6 +43,8 @@
 	-o [directory]	Output directory (default: ./output)
 	-c [count]	Number of segments to include in playlist (live streams only) - 0 is no limit
 	-b [bitrates]	Output video Bitrates in kb/s (comma seperated list for adaptive streams)
+	-p [name]	Playlist filename prefix
+	-t [name]	Segment filename prefix
 	-l		Input is a live stream
 	-f		Foreground encoding only (adaptive non-live streams only)
 ```