Fixes types for Seeder#run

[ksmithut]

The seed.run command returns a array of a single item, and that item contains the array of strings (filepaths of seeds that were run).

This comes from here:

• https://github.com/tgriesser/knex/blob/master/lib/seed/Seeder.js#L37
• https://github.com/tgriesser/knex/blob/master/lib/seed/Seeder.js#L90
• https://github.com/tgriesser/knex/blob/master/lib/seed/Seeder.js#L162

[ksmithut]

The test failures seem intermittent, but I could be wrong. Is there a way to trigger another run or is that test failure legitimate?

[kibertoad]

yeah, that one is not important. Thanks!