Fix CHANGELOG for change that snuck in (#1562)

Author: Luke Bowerman

CHANGELOG.md

@@ -7,9 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [UNRELEASED]
 
+- `IconButton` w/ `size="small"` icon size adjusted to `small` (was `xsmall`)
+- `Space` revert mistakenly applied `flex-shrink: 0`
 - `useDialog` needs to support scenario it is controlled but `onClose` isn't specified
 - Reverts: `HoverDisclosure` toggles visibility with css rather than inserting elements into the DOM
-- `Space` revert mistakenly applied `flex-shrink: 0`
 
 ## [0.9.17] - 2020-10-12