🚧 Update Heroku schema

[catsby]

Hey @bgentry!
I checked out the repo, curl'd the latest Heroku schema, and ran gen/gen.rb, but ran into some errors:

$ gen git:schema_update ❯ ./gen.rb 
Loading schema...
Generating account-feature...
Generating account...
Generating addon-service...
Generating addon...
Generating app-feature...
Generating app-setup...
./gen.rb:416:in `resolve_all_propdefs': undefined method `[]' for nil:NilClass (NoMethodError)
    from ./gen.rb:478:in `block in func_arg_comments_from_model_and_link'
    from ./gen.rb:473:in `each'
    from ./gen.rb:473:in `func_arg_comments_from_model_and_link'
    from (erubis:47:in `block in result'
    from (erubis:30:in `each'
    from (erubis:30:in `result'
    from /Users/clint/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/erubis-2.7.0/lib/erubis/evaluator.rb:65:in `eval'
    from /Users/clint/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/erubis-2.7.0/lib/erubis/evaluator.rb:65:in `result'
    from ./gen.rb:555:in `generate_model'
    from ./gen.rb:585:in `block in <main>'
    from ./gen.rb:580:in `each'
    from ./gen.rb:580:in `<main>'

not being familiar with the project too much, I'm not sure if this is due to an issue with the schema, or gen.rb.

I started looking into it with some debugging, but haven't gotten far, so I thought I'd start this with hopes you can easily see what I can't, or at least provide some debugging tips.

[bgentry]

Hey @catsby, there are a number of new JSON schema features used in the latest schemas that my generator never had support for, and they turned out to be quite difficult to add the last time I looked at it. I believe @cyberdelia's heroku-go Is likely the way forward, though somebody has to convert hk to use it (which shouldn't be that much work at all).

[catsby]

@bgentry ok, thanks for following up. I'll close this