Changelog:
===========
Correctly obtain database URL with SQLAlchemy 2.0
Remove legacy future import in Alembic templates
Add SQLAlchemy 1.4 and 2.0 to the test matrix
Switch to pytest as test runner
Support "check" command #502
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>