minor improvements

examples/parse.rs

@@ -1,6 +1,3 @@
-extern crate clap;
-extern crate hls_m3u8;
-
 use clap::{App, Arg};
 use hls_m3u8::{MasterPlaylist, MediaPlaylist};
 use std::io::{self, Read};

src/error.rs

@@ -101,7 +101,7 @@ impl fmt::Display for Error {
 }
 
 impl Error {
-    fn new(inner: ErrorKind) -> Self { Self { inner } }
+    const fn new(inner: ErrorKind) -> Self { Self { inner } }
 
     pub(crate) fn custom<T: fmt::Display>(value: T) -> Self {
         Self::new(ErrorKind::Custom(value.to_string()))

src/lib.rs

@@ -4,7 +4,7 @@
     clippy::nursery,
     clippy::cargo
 )]
-#![allow(clippy::multiple_crate_versions)]
+#![allow(clippy::multiple_crate_versions, clippy::must_use_candidate)]
 #![warn(
     missing_docs,
     missing_copy_implementations,