add new attr to create_ticket_request (#207)

Author: jasiekkk

descriptions/0/api.intercom.io.yaml

@@ -16007,6 +16007,16 @@ components:
               - email
           example:
           - id: '1234'
+        conversation_to_link_id:
+          required: false
+          type: string
+          description: "The ID of the conversation you want to link to the ticket.
+            Here are the valid ways of linking two tickets:\n
+            - conversation | back-office ticket\n
+            - customer tickets | non-shared back-office ticket\n
+            - conversation | tracker ticket\n
+            - customer ticket | tracker ticket"
+          example: '1234'
         company_id:
           type: string
           description: The ID of the company that the ticket is associated with. The