Update Changelog.

Author: rilipco

CHANGELOG.md

@@ -41,6 +41,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Added `Deque::{swap, swap_unchecked, swap_remove_front, swap_remove_back}`.
 - Make `String::from_utf8_unchecked` const.
 - Implemented `PartialEq` and `Eq` for `Deque`.
+- Added `alloc` feature to enable `alloc`-Vec interoperability.
+- Added `From<alloc::vec::Vec>` impl for `Vec`.
+- Added `From<Vec>` impl for `alloc::vec::Vec`.
 
 ### Changed