update CHANGELOG.md for #3695

Author: bhcleek

CHANGELOG.md

@@ -57,6 +57,8 @@ IMPROVEMENTS:
   [[GH-3633]](https://github.com/fatih/vim-go/pull/3633)
 * Add fuzz snippet.
   [[GH-3636]](https://github.com/fatih/vim-go/pull/3636)
+* Update gopls code action handling.
+  [[GH-3695]](https://github.com/fatih/vim-go/pull/3695)
 
 BUG FIXES:
 * Update [impl](https://github.com/josharian/impl) source path after its default branch was changed from master to main.