Support t.index

[ykzts]

Add the following syntax:

create_table :articles, force: :cascade do |t|
  t.string :title
  t.string :slug
  t.text :content
  t.index :slug, name: 'index_slug', unique: true # same as `add_index`
end

ref: ActiveRecord::ConnectionAdapters::TableDefinition#index

for reference...

Rails 5 ActiveRecord::SchemaDumper to generate a t.index. (rails/rails@99801c6)

[winebarrel]

Thanks! 👍