v0.146.0

BREAKING CHANGE

• nc_contacts_update_contact now returns an
  UpdateContactResponse instead of None, and no longer rebuilds the vCard from
  the supplied fields when the existing card cannot be fetched — it raises. A
  caller that relied on update creating a missing contact must call
  nc_contacts_create_contact instead.

Fix

• contacts: don't report a landed update as failed
• contacts: stop rebuilding vCards on update