Changelog updates for 0.7.21 (#601)

Author: mdodgelooker

CHANGELOG.md

@@ -5,7 +5,7 @@ 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).
 
-## [UNRELEASED]
+## [0.7.21] - 2020-02-26
 
 ### Fixed
 
@@ -22,7 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - `InlineInputText` component
-- `Select` now supports grouped options with a `title` and option `description`, as well as `BoxProps` for layout styling.
+- `Select` now supports grouped options with a `title` and option `description`, as well as `FlexboxProps` for layout styling.
 - `InputDate` and `Calendar` components
 - Download icon
 - Documentation in the icons package README that describes the recommended way to name icons