Create flipflop table

db/migrate/20180405131207_create_features.rb

@@ -0,0 +1,12 @@
+class CreateFeatures < ActiveRecord::Migration[5.2]
+  def change
+    create_table :flipflop_features do |t|
+      t.string :key, null: false
+      t.boolean :enabled, null: false, default: false
+
+      t.timestamps null: false
+    end
+
+    add_column :administrateurs, :features, :jsonb, null: false, default: {}
+  end
+end