text: Title: please update your documentation about IMPORT_EXPORT_USE_TRANSACTIONS
  Body: IMPORT_EXPORT_USE_TRANSACTIONS default is True and not False as documented in latest
  https://django-import-export.readthedocs.io/en/stable/installation.html
  
  IMPORT_EXPORT_USE_TRANSACTIONS = False in settings is **mandatory** if one want to actually import something in a mysql db (at least)
  
  without it :
  
  result = somemodel_resource.import_data(datanew, dry_run=True)
  
  will fail with "ImproperlyConfigured" and no explanation.
  
  spend 3 hours to tweak my csv and test just about this before to look at import_export\resources.py, and its a pity because the project is really cool.