v17 -> v18

Business Registration Issuing Country Type Change

business_registration_issuing_country has been changed from an Enum to a string.

v17

instance = Bandwidth::TfvSubmissionInfo.new(
  business_address: business_address,
  business_contact: business_contact,
  # ...
  business_registration_issuing_country: Bandwidth::BusinessRegistrationIssuingCountryEnum::USA,
  # ...
)

v18

instance = Bandwidth::TfvSubmissionInfo.new(
  business_address: business_address,
  business_contact: business_contact,
  # ...
  business_registration_issuing_country: 'USA',
  # ...
)