Add migration that renames tracks -> enclosures, track_like -> enclosure_like, entry_track -> entry_enclosure
user
```ruby
class RenameTracksToEnclosures < ActiveRecord::Migration[5.0]
  def change
    rename_table :tracks      , :enclosures
    rename_table :track_likes , :enclosure_likes
    rename_table :entry_tracks, :entry_enclosures

    add_column :enclosures      , :type, :string, null: false, default: 'Track'
    add_column :enclosure_likes , :enclosure_type, :string, null: false, default: 'Track'
    add_column :entry_enclosures, :enclosure_type, :string, null: false, default: 'Track'

    add_index :enclosures      , :type
    add_index :enclosure_likes , :enclosure_type
    add_index :entry_enclosures, :enclosure_type

    rename_column :enclosures, :like_count, :likes_count
    remove_column :enclosures, :provider  , :string
    remove_column :enclosures, :identifier, :string

    rename_column :enclosure_likes , :track_id  , :enclosure_id
    rename_column :entry_enclosures, :track_id  , :enclosure_id
  end
end
```
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