fix unnecessary parentheses warnings

Author: SWW13

src/sequence.rs

@@ -361,7 +361,7 @@ macro_rules! delimited(
 #[macro_export]
 macro_rules! do_parse (
   (__impl $i:expr, $consumed:expr, ( $($rest:expr),* )) => (
-    $crate::IResult::Done($i, ( $($rest),* ))
+    $crate::IResult::Done($i, $($rest),*)
   );
 
   (__impl $i:expr, $consumed:expr, $field:ident : $submac:ident!( $($args:tt)* ) ) => (

src/whitespace.rs

@@ -676,7 +676,7 @@ macro_rules! eat_separator (
             $crate::IResult::Done(($i).slice(index..), ($i).slice(..index))
           },
           ::std::option::Option::None        => {
-            $crate::IResult::Done(($i).slice(($i).input_len()..), ($i))
+            $crate::IResult::Done(($i).slice(($i).input_len()..), $i)
           }
         }
       }