chore: combine CHANGELOG to one line

Author: tkxkd0159

CHANGELOG.md

@@ -45,7 +45,6 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### Bug Fixes
 
 ### Breaking Changes
-* (rest) [\#807](https://github.com/line/lbm-sdk/pull/807) `types/rest` package moved to `testutil/rest`
 * (rest) [\#807](https://github.com/line/lbm-sdk/pull/807) remove legacy REST API
 
 ### Build, CI