2.1.0

• Previously, FactorsAsync would incorrectly return an Insights
  object, hiding Factors-specific fields. Bug reported by Bogdan
  Polovyk. GitHub #49.
• Added the following new values to the PaymentProcessor enum:
  • Afterpay
  • DataCash
  • Dotpay
  • GoCardless
  • Klarna
  • Payeezy
  • Paylike
  • PaymentExpress
  • Paysafecard
  • SmartDebit
  • SynapseFI
• Dependencies were updated.