Update CA bundle and add script for future updates

[ob-stripe]

r? @brandur-stripe
cc @stripe/api-libraries

Updates the CA bundle to the latest version, and adds a script to make future updates easier.

[brandur-stripe]

Nice!

What do you think about adding a basic section to the README describing how to run the new script? For stripe-ruby, we have this:

Update bundled CA certificates from the [Mozilla cURL release][curl]:

    bundle exec rake update_certs

(Also, a couple of the builds in the matrix failed with what looks like a problem fetching dependencies. I restarted a bunch of them.)

[ob-stripe]

What do you think about adding a basic section to the README describing how to run the new script?

👍 Pushed a new commit to update the README.

(Also, a couple of the builds in the matrix failed with what looks like a problem fetching dependencies. I restarted a bunch of them.)

Yeah, packagist.org has been acting up a lot these past few days.

[brandur-stripe]

Released as 5.9.0.