Updates for June 28

[Karla Burnett]

Hey everyone,

We have a few changes to the Go, Java, and Ruby bindings this week. Details below!

== API Libraries

  - stripe-go version 15.6.0 has been released. Changelog: https://github.com/stripe/stripe-go/blob/master/CHANGELOG

  - stripe-java version 2.6.1 has been released. Changelog: https://github.com/stripe/stripe-java/blob/master/CHANGELOG

  - stripe-ruby version 1.43.1 has been released. Changelog: https://github.com/stripe/stripe-ruby/blob/master/History.txt

Have a great week!

 - Karla