Add --purge flag to the stamp command #540
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When running migrations, I've occasionally encountered an issue where the database is at a revision that is no longer exists due to a change in the structure of the migrations. When this is the case, it would be useful to be able to purge the revision present in the
alembic_versiontable and stamp the new revision ID that corresponds to the database's current state.Alembic already contains this capability, so I've just added it into the flask-migrate
stampcommand.