* `PowerSchool.authorize()` is now called upon client instantiation. The `auth` parameter must be passed.
* Fixed `Schema.query()` ignoring the `page` parameter, if passed.
* `dcid` renamed to `pk` for `Schema.query()` -- not all table primary keys are `DCID`.
* Removed superfluous print statement when fetching access token.
* Code formatting with `black`