update changelog

CHANGELOG.md

@@ -8,6 +8,7 @@ All notable changes to this project will be documented in this file.
 ### Bug Fixes
 
 * Address issue where `'file'` and `'file_list'` field results were getting mixed. Props [augustuswm](https://github.com/augustuswm) ([#382](https://github.com/WebDevStudios/CMB2/pull/382), [#250](https://github.com/WebDevStudios/CMB2/pull/250), [#296](https://github.com/WebDevStudios/CMB2/pull/296)).
+* Fix long-standing issues with radio and multicheck fields in repeatable groups losing their values when new rows are added. ([#341](https://github.com/WebDevStudios/CMB2/pull/341), [#304](https://github.com/WebDevStudios/CMB2/pull/304), [#263](https://github.com/WebDevStudios/CMB2/pull/263), [#246](https://github.com/WebDevStudios/CMB2/pull/246), [#150](https://github.com/WebDevStudios/CMB2/pull/150))
 
 ## 2.1.0 - 2015-00-05