Add returnParameters in SourceContractItem alongside with parameters

[Pzixel]

Current version of solidity-docgen exposes ast.parameters as args but doesn't expose return values. It's important because natspec.returns only shows return args that were documented which isn't always the case.

It may be worthwhile to expose this.astNode itself so users can always access what they need from solc output.

[frangio]

Exposing return parameters is a good idea.

astNode is a private TypeScript variable but you should still be able to access it in your Handlebars templates. Can you try that and let me know if it works?

[Pzixel]

I'l give it a shot. Thanks for insight, in my actually work