`goose up -fake` to mark migration as applied without running it

Useful if the migration is already applied to the DB and isn't idempotent.

Example:

• I do some prototyping in psql and apply the changes
• I copy the changes into a migration file
• The migration either takes a while or isn't idempotent and shouldn't be applied again

The workaround is to just add the new row in the goose_db_version table. A CLI flag would be a nice convenience for the rare times this is needed.