Added metadata to Data.mock_invoice
Added metadata to Data.mock_invoice

rebelidealist/stripe-ruby-mock,kathyonu/stripe-ruby-mock,gravitystorm/stripe-ruby-mock,dexcodeinc/stripe-ruby-mock,SidestepTechnologies/stripe-ruby-mock,sublimecoder/stripe-ruby-mock,rebelidealist/stripe-ruby-mock,charitywater/stripe-ruby-mock,quantopian/stripe-ruby-mock,vinchi777/stripe-ruby-mock,hinthealth/stripe-ruby-mock,TrevorHinesley/stripe-ruby-mock