Added copyright year notice
Added copyright year notice
samuelbohler/php-bitpay-client,bitpay/php-bitpay-client,initaldk/php-bitpay-client,samuelbohler/php-bitpay-client,initaldk/php-bitpay-client,bitpay/php-bitpay-client,eXcomm/php-bitpay-client,eXcomm/php-bitpay-client