Updates for August 18

[Brandur Leach]

Hi everyone,

We've shipped a few bindings updates over the last few weeks. See details below!

== API Libraries

  - stripe-go version 17.0.0 has been released. Changelog: https://github.com/stripe/stripe-go/blob/master/CHANGELOG

  - stripe-java version 2.8.0 has been released. Changelog: https://github.com/stripe/stripe-java/blob/master/CHANGELOG

  - stripe-php version 3.20.0 has been released. Changelog: https://github.com/stripe/stripe-php/blob/master/CHANGELOG.md

  - stripe-ruby version 1.50.0 has been released. Changelog: https://github.com/stripe/stripe-ruby/blob/master/History.txt

Brandur