DEV: Apply syntax_tree formatting to db/*

db/migrate/20190313171338_add_indexes_to_reviewables.rb

@@ -3,11 +3,11 @@
 class AddIndexesToReviewables < ActiveRecord::Migration[5.2]
   def up
     remove_index :reviewables, :status
-    add_index :reviewables, [:status, :created_at]
+    add_index :reviewables, %i[status created_at]
   end
 
   def down
-    remove_index :reviewables, [:status, :created_at]
+    remove_index :reviewables, %i[status created_at]
     add_index :reviewables, :status
   end
 end