v9.0.0

Changed

• Removed support for PHP 7.0 (#595)
• Require Laravel 5.7 as minimum version (#595)
• Extract updateCard from createAsStripeCustomer method (#588)
• Remove CASHIER_ENV and event checks and encourage usage of VerifyWebhookSignature middleware (#591)
• The invoice method now accepts an $options param (#598)
• The invoiceFor method now accepts an $invoiceOptions param (#598)

Fixed

• Fixed some DocBlocks (#594)
• Fixed a bug where the swap and incrementAndInvoice methods on the Subscription model would sometimes invoice other pending invoice items (#598)