Update wavereader.rs

Fixed typo

src/wavereader.rs

@@ -65,7 +65,7 @@ impl<R: Read + Seek> WaveReader<R> {
      * This function does a minimal validation on the provided stream and
      * will return an `Err(errors::Error)` immediately if there is a structural 
      * inconsistency that makes the stream unreadable or if it's missing 
-     * essential components that make interpreting the audio data impoossible.
+     * essential components that make interpreting the audio data impossible.
      * 
      * ```rust
      * use std::fs::File;