Update to latest version of stripe-php library

composer.json

composer.lock

vendor/composer/ClassLoader.php

vendor/composer/LICENSE

vendor/composer/installed.json

vendor/stripe/stripe-php/.coveralls.yml

vendor/stripe/stripe-php/.gitignore

vendor/stripe/stripe-php/.travis.yml

vendor/stripe/stripe-php/.vscode/extensions.json

vendor/stripe/stripe-php/.vscode/settings.json

vendor/stripe/stripe-php/CHANGELOG.md

vendor/stripe/stripe-php/README.md

vendor/stripe/stripe-php/VERSION

vendor/stripe/stripe-php/build.php

vendor/stripe/stripe-php/composer.json

vendor/stripe/stripe-php/data/ca-certificates.crt

vendor/stripe/stripe-php/examples/oauth.php

vendor/stripe/stripe-php/init.php

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

vendor/stripe/stripe-php/lib/AlipayAccount.php