Updated changelog
Updated changelog

ronin1/braintree_dotnet,ronin1/braintree_dotnet,scottmeyer/braintree_dotnet,braintree/braintree_dotnet,scottmeyer/braintree_dotnet,scottmeyer/braintree_dotnet,braintree/braintree_dotnet,ronin1/braintree_dotnet,scottmeyer/braintree_dotnet