Add image to budget investments.

db/migrate/20170606094459_add_attachment_image_to_budget_investments.rb

@@ -0,0 +1,11 @@
+class AddAttachmentImageToBudgetInvestments < ActiveRecord::Migration
+  def self.up
+    change_table :budget_investments do |t|
+      t.attachment :image
+    end
+  end
+
+  def self.down
+    remove_attachment :budget_investments, :image
+  end
+end