Update CHANGELOG for 4.0.2 yet again
Update CHANGELOG for 4.0.2 yet again

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