style: remove explicit lifetimes where they can be elided (#68)

* remove explicit lifetimes where they can be elided

* fixup rustfmt config file

Author: danieleades

.rustfmt.toml

@@ -1,4 +1,3 @@
-version = "Two"
 use_field_init_shorthand = true
 imports_granularity="Crate"
 wrap_comments = true

src/decoder.rs

@@ -166,7 +166,7 @@ where
     decoder: &'a mut Decoder<M, R>,
 }
 
-impl<'a, M, R> Iterator for DecodeIter<'a, M, R>
+impl<M, R> Iterator for DecodeIter<'_, M, R>
 where
     M: Model,
     R: BitRead,