v0.2.0

This release has significant changes to the configuration API and
VintageNetMobile.Modem behaviour. No migration from the old version is
supported. We don't expect to majorly change the API in future releases. Updates
will be more incremental. The plan is to add configuration migrations so that
devices in the field can continue to work between vintage_net_mobile updates.

To upgrade, find the module documentation for your modem. There will be a
configuration example that should look familiar.