Updates for March 8

[Brandur Leach]

Hi everyone,

We have a few updates since our last announcement:

== API
- Removed `currencies_supported` from the Account object in the
Accounts API. More information can be found here:
https://stripe.com/docs/upgrades#2016-03-07

== API Libraries:
- stripe-go version 12.0.0 has been released. Changelog:
https://github.com/stripe/stripe-go/blob/master/CHANGELOG
- stripe-php version 3.9.2 has been released. Changelog:
https://github.com/stripe/stripe-php/blob/master/CHANGELOG.md
- stripe-python version 1.30.0 has been released. Changelog:
https://github.com/stripe/stripe-python/blob/master/CHANGELOG
- stripe-ruby version 1.36.1 has been released. Changelog:
https://github.com/stripe/stripe-ruby/blob/master/History.txt

Brandur