Update CHANGELOG for 4.8.2
Update CHANGELOG for 4.8.2

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