Add missing use statements.

Author: iago-lito

src/adaptors/mod.rs

@@ -15,7 +15,7 @@ pub use self::map::MapResults;
 pub use self::multi_product::*;
 
 use std::fmt;
-use std::iter::{Fuse, Peekable, FromIterator};
+use std::iter::{self, Fuse, Peekable, FromIterator};
 use std::marker::PhantomData;
 use crate::size_hint;
 

src/lib.rs

@@ -94,6 +94,7 @@ pub mod structs {
         FilterMapOk,
         FilterOk,
         Product,
+        Power,
         PutBack,
         Batching,
         MapInto,