update CHANGELOG.md for #2743

Author: bhcleek

CHANGELOG.md

@@ -35,6 +35,8 @@ IMPROVEMENTS:
   [[GH-2727]](https://github.com/fatih/vim-go/pull/2727)
 * Add a new supported value to `g:go_fmt_command` to format with `gopls`.
   [[GH-2729]](https://github.com/fatih/vim-go/pull/2729)
+* Handle changes to `go test -v` output.
+  [[GH-2743]](https://github.com/fatih/vim-go/pull/2743)
 
 BUG FIXES:
 * Use the discovered full path for gopls when renaming.