Correct incorrect year in CHANGELOG.md.

Author: mattdeboard

CHANGELOG.md

@@ -5,13 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.9.3] - 2020-02-02
+## [0.9.3] - 2021-02-02
 
 ### Fixed
 
 - **The code now compiles on rustc versions not affected by https://github.com/rust-lang/rust/issues/79904**
 
-## [0.9.2] - 2020-02-01
+## [0.9.2] - 2021-02-01
 
 ### Added