Fix #358 Update Stripe SDK

composer.lock

vendor/composer/ClassLoader.php

vendor/composer/InstalledVersions.php

vendor/composer/autoload_classmap.php

vendor/composer/autoload_real.php

vendor/composer/autoload_static.php

vendor/composer/installed.json

vendor/composer/installed.php

vendor/composer/platform_check.php

vendor/stripe/stripe-php/.gitignore

vendor/stripe/stripe-php/.php-cs-fixer.php

vendor/stripe/stripe-php/.php_cs.dist

vendor/stripe/stripe-php/CHANGELOG.md

vendor/stripe/stripe-php/Makefile

vendor/stripe/stripe-php/README.md

vendor/stripe/stripe-php/VERSION

vendor/stripe/stripe-php/composer.json

vendor/stripe/stripe-php/init.php

vendor/stripe/stripe-php/lib/Account.php

vendor/stripe/stripe-php/lib/ApiOperations/Request.php