ssl:endpoint deprecated

[calebhaye]

SSL Endpoint is deprecated (https://devcenter.heroku.com/changelog-items/2145), yet it's still mentioned as a requirement for this api call.

platform-api/lib/platform-api/client.rb

Line 647 in d857d0b

# [SSL Endpoint](https://devcenter.heroku.com/articles/ssl-endpoint) is a public address serving custom SSL cert for HTTPS traffic to a Heroku app. Note that an app must have the `ssl:endpoint` add-on installed before it can provision an SSL Endpoint using these APIs.

[mikehale]

SSL Endpoint was always a bit weird in that you had to create the add-on first, then add a cert after to actually get it working. We've deprecated the add-on, and consequently you won't be able to create "endpoint" certificates anymore. Instead of using SSL Endpoint you should now use Heroku SSL: https://devcenter.heroku.com/articles/ssl.