#EXT-X-IMAGE-STREAM-INF Not handled case

[adamMadoyan]

Thanks for this great library, it's very useful!

I have an issue where I need to merge two playlist, During the parsing #EXT-X-IMAGE-STREAM-INF is not handled and after merging it is removed from primary playlist.m3u8.

Here is my case, I am using this for stick play

#EXT-X-IMAGE-STREAM-INF:BANDWIDTH=6619,CODECS="jpeg",RESOLUTION=240x116,URI="playlist_Thumbnail_I-Frame.m3u8"