update changelog

Author: newpavlov

rand_os/CHANGELOG.md

@@ -4,22 +4,27 @@ 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).
 
+## [0.2.1] - 2019-08-08
+### Fixed
+- Fix `no_std` support.
 
 ## [0.2.0] - 2019-06-06
-Replaced implementation with a backwards-compatible shim around
+### Changed
+- Minimum Supported Rust Version has changed to 1.32.
+- Replaced implementation with a backwards-compatible shim around
 [getrandom](https://crates.io/crates/getrandom).
 
 ## [0.1.3] - 2019-03-05
-### Changes
+### Changed
 - Fix support for Illumos (#730)
 - Fix deprecation warnings from atomic init (#739)
 
 ## [0.1.2] - 2019-01-28
-### Changes
+### Changed
 - Fuchsia: Replaced fuchsia-zircon with fuchsia-cprng
 
 ## [0.1.1] - 2019-01-08
-### Additions
+### Added
 - Add support for x86_64-fortanix-unknown-sgx target (#670)
 
 ## [0.1.0] - 2019-01-04