Add links to CHANGELOG. (#41)

CHANGELOG.md

@@ -5,6 +5,16 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) and this project
 adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+-   Fixed several critical bugs in `Vector` (see PRs #34 and #37).
+-   Removed `Hash` and `PartialOrd` impls for `HashMap` and `HashSet`.
+
+### Added
+-   Added `Vector::insert_ord_by` and `Vector::insert_ord_by_key`
+-   Added `From` impls from arrays.
+
 ## [1.0.1] - 2021-08-12
 
 ### Fixed
@@ -23,3 +33,6 @@ those things which have changed since the fork.
 -   Fixed bugs when deleting elements from large `OrdMap`s and `OrdSet`s
 -   Fixed bugs where iterating over `OrdMap`s and `OrdSet`s could skip some elements.
 
+[Unreleased]: https://github.com/jneem/imbl/compare/v1.0.1...HEAD
+[1.0.1]: https://github.com/jneem/imbl/compare/v1.0.0...v1.0.1
+[1.0.0]: https://github.com/jneem/imbl/compare/releases/tag/v1.0.0