Tweak the changelog

I wrote rubocop#89's changelog entry in the released section by mistake.
This PR tweaks the changelog entry.

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### New features
 
 * [#88](https://github.com/rubocop-hq/rubocop-ast/pull/88): Add `RescueNode`. Add `ResbodyNode#exceptions` and `ResbodyNode#branch_index`. ([@fatkodima][])
+* [#89](https://github.com/rubocop-hq/rubocop-ast/pull/89): Support right hand assignment for Ruby 2.8 (3.0) parser. ([@koic][])
 
 ## 0.3.0 (2020-08-01)
 
@@ -17,7 +18,6 @@
 * [#83](https://github.com/rubocop-hq/rubocop-ast/pull/83): Add `ProcessedSource#each_comment_in_lines` ([@marcandre][])
 * [#84](https://github.com/rubocop-hq/rubocop-ast/pull/84): Add `Source::Range#line_span` ([@marcandre][])
 * [#87](https://github.com/rubocop-hq/rubocop-ast/pull/87): Add `CaseNode#branches` ([@marcandre][])
-* [#89](https://github.com/rubocop-hq/rubocop-ast/pull/89): Support `mrasgn` has the same structure as `masgn` except that the child nodes are reversed for Ruby 2.8 (3.0) parser. ([@koic][])
 
 ### Bug fixes