Update CHANGELOG for v0.39.1 release, adding release date and summari… #1937

Job	Run time
test (mysql, mysql, mysql://root:[email protected]/sqlpage)	2m 14s
test (mssql, mssql, mssql://root:[email protected]/sqlpage)	1m 39s
windows_test	2m 44s
test (postgres, postgres, postgres://root:[email protected]/sqlpage)	2m 0s
compile_and_lint	1m 26s
docker_build (linux/amd64)	5m 39s
test (odbc, postgres, Driver=PostgreSQL Unicode;Server=127.0.0.1;Port=5432;Database=sqlpage;UID=r...	3m 18s
docker_build (linux/arm/v7)	5m 19s
docker_build (linux/arm64)	5m 50s
docker_push	20s
	30m 29s

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