docs: add info log level to readme (#9)

README.md

@@ -167,12 +167,14 @@ Note that requests that time out are [retried twice by default](#retries).
 
 We use the standard library [`logging`](https://docs.python.org/3/library/logging.html) module.
 
-You can enable logging by setting the environment variable `SATURN_SDK_LOG` to `debug`.
+You can enable logging by setting the environment variable `SATURN_SDK_LOG` to `info`.
 
 ```shell
-$ export SATURN_SDK_LOG=debug
+$ export SATURN_SDK_LOG=info
 ```
 
+Or to `debug` for more verbose logging.
+
 ### How to tell whether `None` means `null` or missing
 
 In an API response, a field may be explicitly `null`, or missing entirely; in either case, its value is `None` in this library. You can differentiate the two cases with `.model_fields_set`: