v2.0.0-beta2

Please see the v2.0.0-beta1 release notes for a list of all v2.0.0 changes.

Changes since v2.0.0-beta1:

• Revert the 2.0.0-beta1 changes to Cabo Verde subdivisions.
  These are islands, not municipalities as defined by ISO, so not all of them have a two-letter code. For the sake of consistency we're going back to specifying the full island name as the ID.
• Fix several wrong type hints.
• Make Address type hints non-nullable again.
  This reverts 8b1bcd4 from v1.4.1.