Updated API from documentation release

Author: ct-sdks[bot]

api-specs/api/types/subscription/ChangeSubscriptionResourceTypeId.raml

@@ -19,6 +19,7 @@ enum:
   - customer-group
   - customer-password-token
   - discount-code
+  - discount-group
   - extension
   - inventory-entry
   - key-value-document
@@ -74,6 +75,8 @@ enum:
     Changes to [CustomerTokens](ctp:api:type:CustomerToken).
   discount-code: |
     Changes to [DiscountCodes](ctp:api:type:DiscountCode).
+  discount-group: |
+    Changes to [DiscountGroups](ctp:api:type:DiscountGroup).
   extension: |
     Changes to [Extensions](ctp:api:type:Extension).
   inventory-entry: |