update readme
update readme

quintendf/node_stripe,jpca999/node-stripe-charge,kolbeypruitt/mtm_official,mjhea0/node-stripe-charge,SarahNoel/node-stripe-charge,quintendf/node_stripe,amberwoodrow/node-stripe-charge,lingqingmeng/preorder,yalcindo/stripeFromMike,kolbeypruitt/mtm_official,SarahNoel/node-stripe-charge,lingqingmeng/preorder,jpca999/node-stripe-charge,yalcindo/stripeFromMike,mjhea0/node-stripe-charge,amberwoodrow/node-stripe-charge