Update readme

README.md

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 # CachingPlayerItem
 
-CachingPlayerItem is a subclass of AVPlayerItem that lets you stream and cache media content on iOS. Initial idea for this work was found [here](https://github.com/neekeetab/CachingPlayerItem).
+CachingPlayerItem is a subclass of AVPlayerItem that lets you stream and cache media content on iOS. Initial idea for this library was found [here](https://github.com/neekeetab/CachingPlayerItem).
 
 [![CI Status](https://img.shields.io/travis/sukov/CachingPlayerItem.svg?style=flat)](https://travis-ci.org/sukov/CachingPlayerItem)
 [![Version](https://img.shields.io/cocoapods/v/CachingPlayerItem.svg?style=flat)](https://cocoapods.org/pods/CachingPlayerItem)
@@ -141,3 +141,4 @@ CachingPlayerItem is available under the MIT license. See the LICENSE file for m
 
 - CachingPlayerItem loads its content sequentially. If you seek to yet not downloaded portion, it waits until data previous to this position is downloaded, and only then starts the playback.
 - URL's must contain a file extension for the player to load properly. To get around this, a custom file extension can be specified e.g. `let playerItem = CachingPlayerItem(url: url, customFileExtension: "mp3")`.
+- HTTP live streaming (HLS) `M3U8` caching is not supported. You can only use `init(nonCachingURL:)` for playing M3U8.