title: Snackbar package in AndroidX
body: <p>When migrating a project or switching between branches which are and aren't migrated, Android Studio cannot build projects because it cannot find the <code>android.support.design.widget.Snackbar</code> package. Support/Design packages are removed but the <a href="https://developer.android.com/topic/libraries/support-library/refactor#migrate" rel="noreferrer">migration table</a> does not list the correct new package for this component.</p>