Add changelog entry for the new bat file #6991

Job	Run time
docker-tests	21m 11s
build-mdbook	7s
compiler-warnings	2m 4s
format-check	3m 55s
integration-tests (ubuntu-latest, oopsla19)	19m 31s
unit-tests (ubuntu-latest)	5m 5s
integration-tests (ubuntu-latest, arrays)	9m 43s
scaladoc-check	2m 52s
unit-tests (macos-latest)	3m 46s
integration-tests (macos-latest, oopsla19)	20m 27s
	1h 28m 41s

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