Incomplete documentation in README/Settings

The [Settings section of README](https://github.com/kyleconroy/sqlc#settings) doesn't mention that:

1. `sqlc.json` is also supported as a configuration file.

2. Configuration values for `schema` and `queries` can be a list of paths (supported since [v1.2.0](https://github.com/kyleconroy/sqlc/releases/tag/v1.2.0)).