v0.3.1

Tracks the June–July 2026 Dropbox API spec updates that touch routes
Magpie already wraps.

Added

• Magpie.Files.ListFolder.list_folder/3 and stream/3 now take an
  optional opts map merged into the request body, so callers can use
  the remaining /files/list_folder arguments — including the new
  include_restorable_info flag (each returned deleted entry then says
  whether it can be restored via is_restorable)
• Magpie.Files.ListFolder.list_revisions/4 gained the same optional
  opts map ("mode", "before_rev", "include_restorable_info")

Changed

• Magpie.Files.get_thumbnail_v2/3 docs no longer list "quality" as an
  option — Dropbox pulled the field from the public API surface in the
  July 2026 spec update