Update changelog entry.

Author: reitermarkus

CHANGELOG.md

@@ -39,7 +39,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Added `SortedLinkedListView`, the `!Sized` version of `SortedLinkedList`.
 - Added implementation of `Borrow` and `BorrowMut` for `String` and `Vec`.
 - Added `Deque::{swap, swap_unchecked, swap_remove_front, swap_remove_back}`.
-- Changed `String::from_utf8_unchecked` as const.
+- Make `String::from_utf8_unchecked` const.
 
 ### Changed