oauth-bearer-authorization

- A new `Heroics.oauth_client_from_schema` function can be used to
  create a `Client` setup to use an OAuth token.

- The `README.md` contains some minor corrections and a small section
  demonstrating how to instantiate a `Client` with an OAuth token.

- The `Schema` class has custom `inspect` and `to_s` implementations
  to make `irb` sessions more pleasant.