Merge pull request #950 from coltfred/rand-chacha-0.2.2

Update changelog for rand-chacha 0.2.2

rand_chacha/CHANGELOG.md

@@ -4,8 +4,9 @@ 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](https://semver.org/spec/v2.0.0.html).
 
-## [0.2.2] - 2020-01-20
+## [0.2.2] - 2020-03-09
 - Integrate `c2-chacha`, reducing dependency count (#931)
+- Add CryptoRng to ChaChaXCore (#944)
 
 ## [0.2.1] - 2019-07-22
 - Force enable the `simd` feature of `c2-chacha` (#845)