Omit return keyword in remove_entry

Co-authored-by: David Tolnay <dtolnay@gmail.com>

src/map.rs

@@ -152,7 +152,7 @@ impl Map<String, Value> {
  String: Borrow<Q>,
  Q: ?Sized + Ord + Eq + Hash,
  {
- return self.map.remove_entry(key);
+ self.map.remove_entry(key)
  }
 
  /// Moves all elements from other into self, leaving other empty.