Error while trying to add support for community provider

[VictorGFM]

I've been trying to update this repo to provide support for Cyral provider, but I'm running into some errors right when I try to run make in the schema-extractor directory (this is also related to a similar issue #17), so I assume that the script may be broken, at least for some environments.

Currently, I'm trying to run the script in a Ubuntu system doing the following:

1. Ensure that the $GOPATH is set.
2. Type make inside the ~/.terraform.d/metadata-repo/schemas-extractor directory.

Actual:

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 10083  100 10083    0     0  44813      0 --:--:-- --:--:-- --:--:-- 44813
make: *** [GNUmakefile:16: providers.registry.json] Error 6

Expected:
Being able to run the scripts and generate a schema for the Cyral provider.

Since the project doesn't support the official schema.json generated by using terraform providers schema -json, I'm forced to use the schema in the format generated by the schema-extractor script, but with these errors showing up while I'm trying to run it, I'm unable to do so. Would be very helpful if this could be fixed or/and the Cyral provider could be supported by the plugin, thanks.