TNPExtension

A simple set of extensions to help with the torrent_name_parser crate.

```rust use torrentnameparser::Metadata; use tnp_extensions::TNPExtensions;

let m = Metadata::from("narcos.s01e10.1080p.bluray.x264-rovers").unwrap(); println!("first Ep:{}", m.firstepisode().unwrap()); println!("last Epi:{}", m.lastepisode().unwrap()); println!("ismulti: {}", m.ismutli_episodes());

let m = Metadata::from("narcos.s01e10e11.1080p.bluray.x264-rovers.srt").unwrap(); println!("first Ep:{}", m.firstepisode().unwrap()); println!("last Epi:{}", m.lastepisode().unwrap()); println!("ismulti: {}", m.ismutliepisodes()); println!("issubtitle: {}", m.is_subtitle()); ```