Update CHANGELOG.md
Update CHANGELOG.md

billCTG/braintree_ios,Feverup/braintree_ios,Feverup/braintree_ios,billCTG/braintree_ios,apascual/braintree_ios,billCTG/braintree_ios,braintree/braintree_ios,apascual/braintree_ios,apascual/braintree_ios,braintree/braintree_ios,Feverup/braintree_ios,billCTG/braintree_ios,apascual/braintree_ios,braintree/braintree_ios,braintree/braintree_ios,billCTG/braintree_ios,Feverup/braintree_ios