Update integr8/md (prebid#4890)

Author: ZikaMyhedin

dev-docs/bidders/integr8.md

@@ -15,4 +15,5 @@ sidebarType: 1
 |---------------|----------|------------------------------------------------------------------------|--------------------|-----------|
 | `propertyId`  | required |Property id                                                             | `"12345"`          | `string`  |
 | `placementId` | required |Placement id                                                            | `"54321"`          | `string`  |
+| `deliveryUrl` | optional |Custom endpoint url for the bid request                                 | `"https://central.sea.integr8.digital/bid"`     | `string`  |
 | `data`        | optional |Catalog data (contents) and/or inventory data (custom key/value pairs)  | `{catalogs: [{ catalogId: "699229", items: ["193", "4", "1"] }], inventory: { category: ["tech"], query: ["iphone 12"] }}` | `object` |