Update CHANGELOG for v0.39.1 release, adding release date and summari… #1938

Job	Run time
compile_and_lint	1m 59s
test (postgres, postgres, postgres://root:[email protected]/sqlpage)	1m 40s
test (mysql, mysql, mysql://root:[email protected]/sqlpage)	1m 22s
test (mssql, mssql, mssql://root:[email protected]/sqlpage)	1m 51s
test (odbc, postgres, Driver=PostgreSQL Unicode;Server=127.0.0.1;Port=5432;Database=sqlpage;UID=r...	2m 31s
windows_test	2m 25s
docker_build (linux/arm64)	6m 15s
docker_build (linux/arm/v7)	5m 20s
docker_build (linux/amd64)	5m 6s
docker_push	16s
	28m 45s

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