Release v0.7.0

New feature:

• Add support for schulmanager-online.de (Elternbriefe only)

NOTE: The layout of the state.json file has changed. Given that we haven't hit the million users mark yet, suffice it to say: Please put everything under a new ep key, otherwise you will get another email for everything. You can also just use the --once --mute flags (after making sure there are no actual updates right now).