removed warnings

src/lib.rs

@@ -3,7 +3,7 @@
 #![crate_type = "dylib"]
 
 #![doc(html_logo_url = "./icon.png")]
-#![feature(core, io, unicode, collections)]
+#![feature(core, io, unicode)]
 
 extern crate "rustc-serialize" as rustc_serialize;
 extern crate byteorder;

src/reader.rs

@@ -228,7 +228,7 @@ impl<'a, R: Read> Decoder for DecoderReader<'a, R> {
         }
 
         let res = try!(match str::from_utf8(&buf[..width]).ok() {
-            Some(s) => Ok(s.char_at(0)),
+            Some(s) => Ok(s.chars().next().unwrap()),
             None => Err(error)
         });