move readme comment to out of 0.0.40 section

CHANGELOG.md

@@ -1,13 +1,13 @@
 # [`master`](https://github.com/elastic/eui/tree/master)
 
 - add disabled prop to `EuiComboBoxOption` ([#650](https://github.com/elastic/eui/pull/650))
+- Close `EuiComboBox` `singleSelection` options list when option is choosen ([#645](https://github.com/elastic/eui/pull/645))
 
 # [`0.0.40`](https://github.com/elastic/eui/tree/v0.0.40)
 
 - Tweaked sizing, weights, color, line-heights, and added more levels to `EuiTitle` and `EuiText` ([#627](https://github.com/elastic/eui/pull/627))
 - Add TypeScript type defitions for `EuiPortal`, `EuiText` and `EuiTitle` as well as the `calculatePopoverPosition` service ([#638](https://github.com/elastic/eui/pull/638))
 - Grayed out labels for `disabled` controls ([#648])(https://github.com/elastic/eui/pull/648)
-- Close `EuiComboBox` `singleSelection` options list when option is choosen ([#645](https://github.com/elastic/eui/pull/645))
 
 **Bug fixes**