Updated 3-cloud-storage README
Updated 3-cloud-storage README

GoogleCloudPlatform/getting-started-ruby,remi/getting-started-ruby,GoogleCloudPlatform/getting-started-ruby,GoogleCloudPlatform/getting-started-ruby,GoogleCloudPlatform/getting-started-ruby,remi/getting-started-ruby,remi/getting-started-ruby,remi/getting-started-ruby