update readme
update readme

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