NZOI / nztrain / 16387247898

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Add migration version to all prior db migrations

Rails 5.1 requires this, and it's available since 5.0 so we can just
roll with it now.

https://github.com/rails/rails/blob/<a class=hub.com/NZOI/nztrain/commit/434c8dc96759d4eca36ca05865b6321c54a2a90b">434c8dc96/activerecord/lib/active_record/migration/compatibility.rb#L105-L112
https://github.com/rails/rails/blob/434c8dc96759d4eca36ca05865b6321c54a2a90b/activerecord/lib/active_record/migration/compatibility.rb#L6-L93
https://www.bigbinary.com/blog/migrations-are-versioned-in-rails-5
https://github.com/rails/rails/pull/21538

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