minor #1259 [Autocomplete] Update Changelog (JoppeDC)

This PR was merged into the 2.x branch.

Discussion
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[Autocomplete] Update Changelog

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| License       | MIT

Add a note to autocomplete changelog that 5.4 support was dropped.

Commits
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ee107c0 Update CHANGELOG.md

Author: weaverryan

src/Autocomplete/CHANGELOG.md

@@ -3,6 +3,7 @@
 ## 2.13.0
 
 -   Add new BaseEntityAutocompleteType
+-   Drop symfony 5.4 support.
 -   Add Symfony 7 support.
 -   Change JavaScript package to `type: module`