* Go program to output openapi
* Fix number type syntax
Resolves error: 'unsupported op for number &'
* Render just the schemas
* Use args as entrypoints and add test
* Update README, tidy go.mod
Lead all top-level properties that we do not intend to export with an
underscore.
In 2.2.0, only definitions starting with a capital letter were exported.
As well, properties with a leading underscore were not visible to an
entire package - just within the same file. 3.0.0 still considers them
hidden, however, they are now visible to an entire package.