Appstoreconnect

Features:
- New `split_response` argument in `download_finance_reports()` function that splits the response into 2 objects. Defualt value is `split_response=False`. This also
allows the 2 responses to be saved to separate files using a syntax like `save_to=['test1.csv', 'test2.csv']`. (GClunies)

Bugfixes:
- Add default versions and subtypes in download_sales_and_trends_reports

Features:
- New endpoints:
- delete_beta_tester
- read_beta_tester_information
- modify_beta_group
- delete_beta_group
- read_beta_group_information
- read_beta_app_localization_information
- create_beta_app_localization
- modify_registered_device
- read_beta_app_review_submission_information
- Collect anonymous usage statistics

Breaking changes API:
- new parameters for create_beta_tester
- new parameters for create_beta_group
- new parameters for submit_app_for_beta_review
- register_device renamed to register_new_device

Features:
- New endpoint: register_device (BalestraPatrick)

Features:
- New endpoints: invite_user and read_user_invitation_information (BalestraPatrick)

Bugfixes:
- Fixes create_beta_tester endpoint URL (BalestraPatrick)

Bugfixes:
- Fixes token re-generation (gsaraceno)