Ecto.Migrator.run/4

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Apply migrations in a directory to a repository with given strategy.

A strategy must be given as an option.

## Options

  * `:all` - runs all available if `true`
  * `:step` - runs the specific number of migrations
  * `:to` - runs all until the supplied version is reached
  * `:log` - the level to use for logging.
    Can be any of `Logger.level/0` values or `false`.
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