feat: add deposit type to stays payment type

Author: SamHutchings

src/Stays/StaysTypes.ts

@@ -123,9 +123,10 @@ export interface StaysRate {
   id: string
 
   /**
-   * The accepted payment method for this rate. Prepaid rates require payment at time of reservation. Accepted types: pay_now, guarantee
-   */
-  payment_type: 'pay_now' | 'guarantee'
+   * The accepted payment method for this rate. Prepaid rates require payment at time of reservation.
+   * Deposit rates require a deposit payment, then the remainder at the accommodation.
+   * */
+  payment_type: 'pay_now' | 'guarantee' | 'deposit'
 
   /**
    * The supplier from which Duffel got this rate