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Generates a migration.

## Examples

    mix ecto.gen.migration add_posts_table
    mix ecto.gen.migration add_posts_table -r Custom.Repo

By default, the migration will be generated to the
"priv/YOUR_REPO/migrations" directory of the current application
but it can be configured by specify the `:priv` key under
the repository configuration.

## Command line options

  * `-r`, `--repo` - the repo to generate migration for (defaults to `YourApp.Repo`)
  * `--no-start` - do not start applications
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